Questions
in my mailbox about humidifiers. Which is best?
This
week I have received a number of emails, asking me virtually
the same thing. Which are better, warm
or cool mist humidifiers? What is the difference between
cool and warm mist, or whether our cool mist humidifiers
disperse mineral dust? In addition, some people just wish
to know which is the BEST humidifier and want to drill
down deeper beyond the comparison charts and our detailed
product write ups. Others are asking about combination
humidifiers and air purifiers. So here goes
this
is what I would say if I were on the phone to you.
Mineral
Dust: That's an easy one. None of our humidifiers,
cool or warm disperse mineral dust.
What's
the difference between Warm and Cool Mist?
At the risk of being facetious, one gives out a warm
mist, the other gives out a cool mist. One is cool,
the other is warm. Need more explanation? Well, imagine
being in a greenhouse that is how a warm mist feels.
People who like warm mists generally live in colder
parts of the USA or like to put a warm mist humidifier
into a baby's room.
Conversely,
people who like cool mists live in warmer climates,
the last thing they want is to warm the place up a few
degrees. If you live in a colder climate the cool mist
could feel a trifle clammy if you over-humidify the
room. To avoid over-humidification we recommend a built-in
humidistat or a standalone
humidistat.
The
BEST humidifier?
There really is no cookie cutter answer for you. Our
humidifier
comparison chart does try and rank order them for
you, and we have currently completed annual edits to
this chart, but it all depends what features are most
important to you, apart from the geographical considerations
mentioned above.
Features:
There are however certain features which I consider important.
Ease
of Cleaning: Here the Hunter
cool mist line wins hands down with their Permawick
filters and patented system. No changing of filters
ever, and only cleaning once a season. Definitely, the
choice for people on the run or who hate extra cleaning
chores. The most tedious of our humidifiers to clean
is the Slant
Fin warm mist, but if you want a good warm mist
humidifier, it is really the only choice worth talking
about. The Hamilton
Beach line is somewhere in between as you can wash
it in the dishwasher, and filters need changing every
three months.
Built-in
Humidistat.
I think this is a great feature to have on a humidifier.
Why? Because the tendency is to over-humidify a room
and then cause mold and dust mite problems. I used the
Hamilton
Beach all last season, and was amazed when I set
my humidity level at 35%-45%, well below mold or dust
mite causing levels, how often the machine turned itself
off, and the water tank lasted anywhere from 2 to 3
times as long as my previous machine. In fact, the water
lasted about 6 days in our very dry condo. We tested
the accuracy of the Hamilton Beach humidifier's humidistat.
Impressive, within two degrees of accuracy at all times.
Noise
level. This is a matter of personal choice,
but everyone dislikes very noisy appliances. Be very
clear about one thing, all appliances of this kind have
SOME degree of noise attached to them. Some people are
very noise sensitive. For those people I recommend a
Slant
Fin warm mist. The least noisy of the cool mists
are the Hamilton
Beach. My noise sensitive husband has a hard time
hearing this one and has not complained about noise.
Hunter have made huge improvements to the noise level
of their line, and their machines are much less noisy
this year, but I am leery of recommending them to people
who say that any noise whatsoever at night in their
bedroom is a problem for them.
Automatic
Shut Off.
when empty or humidity level reached. The top of the
line Hunter
models have an automatic shut off when the unit is empty
which appeals to me from a safety perspective.
Bacteria
Free?
Except for the Hunter
models, you really do have to wash out humidifiers at
a very minimum on a weekly basis, or every time you refill
the water tank. This is why I only use them when I have
to, which is in winter when my sinuses are killing me.
Combination
Air Cleaner and Humidifiers;
Generally speaking this when you get the worst of both
worlds, and yes we have tried out all the new combo
models. Most are over priced, and poor quality. I could
froth at the mouth about this trend. I have seen NO
appliance of this type I want to rave about. However,
if you twist my arm, the Bemis
Two-in-One is not over priced, the filter is not
a true HEPA, but we tested it at 92% efficiency. Only
good for a small room but a nice buy. At least with
this machine, I do not feel the consumer is being taken
for a ride. In my opinion, avoid anything that talks
about "air washing". There are several of
them out there. I could give you chapter and verse as
to why I do not like them but try and keep my most scathing
comments about particular appliances to a private format
for legal liability reasons.
Some
people in our office with both sinus and allergy problems
use the Bemis
Two in One machine in their office cubes to both
purify and humidify the
immediate area. It is also a good baby's room machine.
Whole
House Humidifiers.
We have been leery of the ones you build into the furnace.
Too many potential mold problems can occur if you forget,
and do not clean them religiously. I would rather you
bought a larger area humidifier and used an auxiliary
digital
humidistat to monitor your home's humidity. We now
have some reasonably priced whole-house sized ones from
the Bemis
line. They do not have much in the way of bells and
whistles, but they can humidify a large space.
President's
Pick.
So what is my designated humidifier winner for this season?
Personally,
my first choice would buy one of this season's brand
new Hunter
Humidifiers. There is a separate lengthier review
of their machines in our next newsletter issue. Hunter
has completely revamped their line up, cleaned up their
act after a product recall last winter, and I now feel
comfortable giving them a top rating again.
Here
is my reasoning. I am too busy to clean these darn things.
It is not because I am lazy, I just work an incredible
number of hours per week and I have very little time
left for other things. In addition, I am firmly in favor
of built-in digital adjustable humidistats. The new
Hunter
line has both these important features. However, in
our alternate night test in our bedroom between the
two brands, my husband was back to maligning the Hunter
(which we used to use) as more noise than he wants to
sleep with. So in our house, we are sticking with the
Hamilton
Beach. However, if noise is not a critical issue,
I predict that Hunter have come out with a winner, now
combining ease of cleaning with ease of regulating the
humidity.
http://www.allergybuyersclubshopping.com/warm-cool-mist-humidifiers.html
For
a quick updated comparison guide.
http://www.allergybuyersclub.com/compare-humid.html
New
Offer! Hamilton
Beach Humidifier 3.5 gallon with digital humidistat.
Save $20. $69.95 until November 30th, 2002. Do not forget
to see the fast streaming video of the Hamilton Beach
humidifiers
http://www.allergybuyersclubshopping.com/hb-hu-hamiltonbeach-humidifiers.html
Top
|
|
Q
& A. How to visit relatives when they have cats
and you have allergies.
Q.
Mercia -- I am allergic to cats. I do not own
a cat, but my sister and several of my friends do. When
I go over there, I have about 30 minutes to and hour before
I start feeling symptomatic. I have a hard time breathing
and my chest becomes congested. My nose itches I sneeze,
and a terrible flavor comes from my chest when I cough.
I do not expect them to go to these extremes just for
my benefit. So I ask you, is there anything I can take
that will alleviate these symptoms? Is there a type of
allergy medicine or anything like that I could take to
prevent this? It makes me feel awful for days afterward.
Thanks! If you can respond as soon as possible, that would
be great!
-Ken
Ken,
There is prescription medication available from your Allergist
- Claritin and Allegra are the big ones. Claritin will
soon be sold over the counter. Your pharmacist will know
when it is available over the counter and how soon before
a visit you would start to need taking it.
If
you invest in a powerful but small air cleaner - say
the Hamilton
Beach on site (largest size) and put it on high
for 2 hours before you came into the room, you would
find that there should be a massive diminution of symptoms
(I have done this with my own guests- not perfect, but
huge improvement). These two approaches together should
get you through!
http://www.allergybuyersclubshopping.com/hb-ap-hamiltonbeach-air-purifiers.html
I
hope your friends could bring themselves to thoroughly
vacuum and keep the cats out of the room while you visit.
That is the least they can do. Good luck!
Top
|
President's
Pick for Holiday Gifts
My
staff are asking me for suggestions on this topic. What
they should give their parents or how to treat himself
or herself? They all know that I know our product line
backwards and forwards and what really offers the best
value. We do have a Gifts
Ideas page with lots of suggestions but here are some
of my favorites.
1.
Last year, I gave my elderly father a lambswool
mattress pad. $139.95 He loved it.
2.
Sheets the all around favorite gift this year: In our
office, Shani and Heather would recommend the silk
sheets; I personally think the DIVA
400 TC sheets are wonderful especially at the 2
for one special $279.95 good till Nov 30,2002. I am
giving DIVA sheets to my sister and Father. My husband
is giving DIVA sheets to his family too. My husband,
who has feet and hands like ice-blocks, is also a fan
of our Luxor
jersey sheets as they feel warmer to the touch when
you slide into bed here up North.
3.
Shower
filters. I had great success with my husband with
this massage
shower-head filter. It also has a huge amount of
high quality filtration media in it. Shower filters
make a good guy gift. $59.95.
4.
Those on my staff who have been craving a Miele
vacuum cleaner are choosing the Aluminium
at $899.95. Miele's best value right now in top of the
line vacuum cleaners. The value conscious folks are
going for the EIO
family vacuum because they know how well it is made
and what a deal it is for the price at $499.95.
5.
Steamax
steam cleaner. What a great little steam cleaner
for the price. We had a special price from the manufacturer
on them and have a few left. Put Steam300 in the coupon
field at check out while supplies last of specially-priced
inventory left. $300 off the regular price of $699.95,
now $399.95. An incredible deal at well below our usual
wholesale cost.
6.
The DirtTamer
HEPA cordless vacuum. My husband rushes to clean
up with it every time I grumble about the crumbs he
leaves behind or autumn leaves he is trampling in from
outside. Because of arthritis in my hands, I personally
find it a little too heavy, but this vacuum is selling
well among my staff for presents. My husband has this
one to give to a family member on his list. Great for
the car as well and comes with some useful attachments.
$74.95.
7.
What do I want myself? (besides my new cat) I have ordered
an Arts
and Crafts bed from $625.00 to complement my existing
Royal
Pedic mattress from $849.00. After it comes, I will
give you a full review. An Eiderdown comforter $5,999.95
would be simply divine, but the Siberian Down Venus
at $1,199.95 would be a heck of a great and luxurious
comforter. Need to order early here.
Top
|
Sheets
for Cal King Beds
I
sleep in a California king-size Royal-Pedic
bed, and for some reason unbeknownst to me, manufacturers
do not like to make bed linens for that size. So after hunting
around, I am pleased to report we have THREE great alternatives
for Cal king bed owners. One is our Luxor
jersey sheet line, and the other our Diva
400 cotton thread count line. The DIVA king size fits both
regular and Cal King both in sheets and duvet covers. The DREAMFIT
line weighing in at 310 thread count is also a popular choice.
It is especially designed for people with extra deep mattresses.
The cotton sateen finish has a slightly fuzzy feel to it after
washing.
The
DIVA
line is for those who like a plain but very silky and
smooth high thread count sheet; the Luxor
line is for those in the Northern climates who like to
get into bed at night and feel sheets that are fine but warm
to the touch. Both have introductory special offers good until
November 30 2002. See details on our special offers page.
Top
|
Comparing
IQAir and Clarifier Air Purifiers Our Two Best
By
David Barnaby. AllergyBuyersClub.com Staff
Editor's
note. David is one of our air cleaner experts and often
gets asked this question. This is what he wrote last week
to one of our customers. As you can see he tries to be
very fair although he does have a bias in the IQAir direction.
Both
the IQAir
and the Clarifier are excellent air cleaners. Both units are
for serious allergies and rate the two highest on our
websites. There are some differences however, that will
explain why it may appear the Clarifier at first glance
is a more efficient, valuable machine but on closer
inspection, it is a tougher call to make between them.
The
IQAir does not have as many air changes as the Clarifier, but it makes up for it based on the fact that
the machine efficiency is at least 99.99% down to 0.3
of a micron and larger and 99.5% efficient on the remaining
particulates including particulates as small as 0.01
of a micron. Therefore, the IQAir HealthPro Plus should
in reality clean as much air in a 600 to 900 square
foot area as the Clarifier.
Regarding
the gas filters, the Clarifier's filter consists of fifteen
pounds of carbon. That is one of its chief strengths.
However, the life of a gas filter is directly proportional
to how much it is exposed to particulates. The pre-filter
on the Clarifier will filter out particulates 5 to 10
microns and larger which means a large number of smaller
particulates will fill the pores of the carbon in the
gas filter. Once the pores of the carbon become clogged
they are not able to adsorb any gases and odors. Contrary
to this, the V-5 gas filter in the IQAir should be able
to perform as long as the Clarifier because of the fact its
pre-filter will remove 90% of all the particulates entering
the air cleaner. However we have not done any specific
comparative testing of this difference, this is just
my opinion. (Editor's note: Our experience in our office
is the Clarifier unit is outlasting the IQAir in duration)
The
Clarifier has the UV light which will continually bathe
the viruses, germs, bacteria, mold and any micro-organisms
trapped in the HEPA filter and on the surface level
of the hepa filter they will be sterilized. Also, the
particulates that make it through the HEPA filter will
be exposed to the UV light so their DNA and RNA will
be broken down so they can't reproduce. The IQAir does
not have this feature.
Many
of our customers are concerned with mold right now,
which is why we particularly like the Clarifier unit
for areas such as moldy and musty basements. However,
the IQAir makes up for this shortcoming by removing
almost everything on first pass, that goes into the
unit from the air (known as its "Efficiency").
This near 100% efficiency should in theory, attain approximately
the same result as the Clarifier by not allowing the particulates
from circulating in the air to be inhaled. In addition,
in the case of mold, whether it is dead or alive, is
not as important as removing it from the air, because
it is the inhalation of particulates that provokes the
allergic reaction.
In
conclusion, I want you to understand that both units
are excellent air cleaners and achieve very good results
through the use of differing but similar technologies.
In my opinion, the IQAir has by far the superior pre-filter
of any air cleaner in the industry and is among the
easiest when it comes to changing filters. The efficiency
of its filter system in my personal testing of all the
machines is second to none. The Clarifier unit is however
a very powerful unit with a substantial amount of carbon
fill, and because it does not have the extra heavy duty
pre-filter of the IQAir, covers more square footage.
If
you have any questions please feel free to contact
me.
(Editor's
note. We debate the pros and cons of these two machines
here in the office constantly. Both are very effective
as per our ratings on our site. Personally, I like the
Clarifier unit for strong odors, smoke and musty smells.
I prefer the IQAir as an all around unit because of
design and ease of use features.)
http://www.allergybuyersclubshopping.com/airpurifiers.html
Top
|
Top
of Line Steam Cleaner Comparisons
By
Bob Cobe, AllergyBuyersClub.com Staff
*
For our comparison charts on steam cleaners, click
here.
* Why do some steam cleaners cost more than others? click
here.
* FAQ on steam cleaners click
here.
* Customer review of Tidyvap (on sale till Dec 31st, 2002)
click
here
* Video of steam cleaners click
here.
The
major advantage of our best quality steam cleaners line
have over their competition, is their continuous fill
feature. This means that when you run out of water to
produce the steam, you do not have to wait for the pressure
and temperature to decrease sufficiently to allow you
to remove the filling cap, nor do you have to reheat
an entire boiler full of water. With the continuous
fill line you remove the filler cap, pour in water,
replace the cap, and continue your work. With practice
this can be done in less than 30 seconds.
And
while you may have to fill more frequently than other
models, the convenience of not having to stop your work
for about 15 minutes might have you using them more
frequently.
The
TidyVap
Steam Cleaner at $799.95 starts the line. The Tidyvap
is on sale for $699.00 until December 31st 2002. It
would be fine for a home of about 1000 -1500 square
feet, and being used for an hour or so each week. It
features a stainless steel boiler and produces both
a "dry" mist and a sufficiently hot temperature
for excellent cleaning. It does have some minuses, however.
The boiler is the smallest of the line and needs more
frequent filling; there is no pressure gauge to let
you know that you are running out of steam so that you
might stop spraying for about a minute to let the pressure
rebuild; and it lacks both the triangular brush and
the window squeegee; but both of which can be ordered
separately for about $50 each. All of the tools for
the TidyVap are the same excellent quality as their
more expensive siblings.
The
LadyBug
Steam Cleaner at $1099 is our bestseller and is
ideal for most households. It would be a good choice
for a home between 1000 and 2500 square feet and for
use of about 2 to 3 hours a few times a week. It has
a complete selection of excellent quality tools and
a pressure gauge that allows you to be aware of any
pressure drop and adjust your use. It's heavier wiring
and larger boiler would give it a longer useful life
than the TidyVap.
Next
in our line of Steam Cleaners at $1299 is the LadyBug
XL that is sufficiently well made to be rated for
light commercial use. It would also be the choice for
homes over 2000 square feet or for use around 3 - 4
hours every day. It is slightly larger than the regular
LadyBug and has an on-board tool caddy to allow you
to keep all of the tools with you. And while it is convenient
to have all of the tools on board, it does add to the
weight and also to the width. The boiler temperature
is about 10 degrees more than the LadyBug and will produce
steam for a longer time period. The main feature of
this machine is its ability to protect the wiring joints
from overheating, which allows the XL to be used continuously
for much longer periods of time.
Our
premium Steam Cleaner is the Vapor
Jet 2400 (with a cart) at $1999 and would be an
excellent choice for very large areas or for commercial
or industrial use. It's larger boiler and internal design
allows it to be used for long periods of time without
the temperature or pressure dropping too much. A possible
minus to this unit would be the steam volume controls
are on the body and not on the handle, were it not for
the fact that once you set the control, you rarely have
to change it. On low steam this unit will function for
up to 4 hours making it ideal for areas where a water
source is not conveniently available. An ideal use for
this unit would be for commercial residential cleaning,
restaurants, hospitals, used car dealerships, and situations
needing a long steaming time.
For
our complete line of vapor steam cleaners including
those listed above, click
here.
http://www.allergybuyersclubshopping.com/vapor-steam-cleaners.html
Top
|
Q
& A: How to kill eggs and fleas with Steam Cleaning
Q.
How long should I steam things to be sure they're sanitized?
Say you're wanting to clean counter tops or kill dust mites
& flea eggs, are there different times the steam should
be held in one spot to be sure it's killing germs, mites, &
eggs? Just curious. I read all the FAQ's
& didn't see anything addressing this question. Thanks!
-Matt
M
A.
With a quality vapor
steam cleaner such as the units we carry, the temperature
that can be maintained with a brush at the end of the wand
will be about 180 - 210 degrees. And by wrapping the end of
the larger brush with a towel to trap the steam before it
loses heat, the temperature will be about 210 - 240 degrees.
The effective
temperatures for killing dust mites is 135 degrees, flea eggs
at about 140 degrees, and many bacteria (such as e-coli) at
165 degrees; all of these temperatures are well under the
high operating temperatures of these units.
My suggestion
would be to move the brush on solid surfaces at a rate of
about 1 inch per second, and with surfaces such as mattresses
and upholstery about ½ inch per second.
Remember
to use as little steam as possible when you are cleaning.
When you use too much steam, the excess moisture created dissipates
much of the heat before it can be used for cleaning.
Top
|
Problems
While Flying And How to Avoid Them
By
Murray Grossan MD http://www.sinus-relief.com/
A recent
Journal of AMA examined the difference in catching the
common cold among passengers. They concluded that there
wasn't much difference between the recirculated and the
unfiltered fresh air. But they did find a high incidence
of common cold between both sets of passengers. The poor
allergic passenger today must deal with enormous problems
while flying, in addition to the peanut sensitivity.
The
planes are DRY. As the planes lower their cabin pressure,
less moisture is contained in the air. Dryness means
that thick mucus just sits there to allow bacteria to
multiply. The antihistamine that the allergic person
takes may add to the nasal dryness. To add to the insult,
the cortisone nasal sprays also dry the nose. The preservatives
in some of the nasal moisturizers may irritate the poor
nose. This is even worse if you have had recent nasal
surgery! No wonder allergic persons are worried about
flying!
However,
there are a few simple steps that can make the trip
less of a problem for the allergic individual. Indeed,
if the air is fresh, there is little or no pollen at
30,00 feet. This can be an advantage, as long as we
don't allow the nose to dry out.
Steps
to take:
* Avoid ice drinks. These may slow the nasal cilia and
therefore promote infection.
* Avoid alcohol and coffee. Any caffeine can dry you
out.
* Use a nasal moisturizer spray without preservative.
One such is Breathe. ease XL Or, you can make it yourself.
About every two hours is often the best plan.
* Carry your own tea bags, preferably a mint type, decaffeinated.
You can always get hot water, but getting tea can be
difficult. Besides, you need to drink lots of it to
keep the nose moist, so having your own tea bags with
you makes that easy.
* You can use Breath.ease XL Nasal Moisturizing Gel.
This has the advantage of covering the nasal tissue
to help prevent the virus from entering. The cold virus
needs to contact the ICAM 1 on the nose, which is the
portal of entry. If the ICAM 1 of the nose is covered
and protected by the gel, this makes it hard for the
virus to enter the body. Breathe. ease gel moisturizes
at two levels: the nasal level and the cell level. The
cell level being moisturized allows natural body defense
elements to get to the invading organisms. The gel should
be applied before boarding and about every four hours
during flight. I usually recommend using it twice a
day for two days after arrival. More information on
this nasal gel is at www.sinus-relief.com
. This gel is also useful for nosebleed due to dryness.
* Carry
Kleenex with you. When the guy next to you starts coughing
and sneezing, hand it to him so he can cover up.
* Once you arrive, after your flight, you can resume
your prior allergy medications.
* There is an added benefit to drinking huge amounts
of hot tea. The exercise you get when you need to go
to the bathroom is helpful to prevent blood clots from
sitting cramped and inactive. Other suggestions for
avoiding blood clots are at http://www.thrombosisonline.com/economy_class_syndrome
Asthmatics
must, must, must carry their medications with them at
all times. The more you need the medication, the more
probable that you may lose it if it is in your luggage.
Especially if you are going overseas, it's a good idea
to have the medications in prescription containers.
(my son had all his medication taken away because it
was in miscellaneous doctor sample containers).
Speaking
of overseas, I generally give my allergic patients two
3 cc disposable syringes to take with them. You can
get most medications any place you travel, but the syringes
may be boiled and reused. Having your own disposable
syringes could be lifesaving.
Airlines
try to follow diet restrictions but if your food allergy
is severe, bring your own food with you as a backup
after you have checked your special tray. Also you can't
always expect the servers to know what a gluten free
diet is. Check out what the kosher meal is like; usually
that is plain and simple without mystery sauces.
Do
have a pleasant trip!
BreatheEase
can be obtained from http://www.sinus-relief.com/
References:
Aircraft Cabin Air Recirculation and Symptoms of the
Common Cold
Jessica Nutik Zitter; Peter D. Mazonson; Dave P. Miller;
Stephen B. Hulley; John R. Balmes
Journal American Medical Association. 2002;288:483-486
Top
|
|
Three
Methods for Nasal Saline Irrigation compared. Interest
to Sinusitis sufferers.
David
E. L. Olson, MD; Barry M. Rasgon, MD; Raymond L. Hilsinger
Jr., MD
From the Department of Head and Neck Surgery, Kaiser Permanente
Medical Center, Oakland, California, U.S.A.
Objective:
To compare intranasal distribution of saline solution
delivered by three popular methods for nasal saline
irrigation.
Study
Design: Prospective, controlled comparison.
Methods:
Eight healthy adult volunteers received nasal irrigation
with 40 mL of isotonic, nonionic contrast material immediately
before having coronal computed tomography to visualize
distribution of solution in the paranasal sinuses. For
each study subject, three methods of irrigation were
used: irrigation using positive-pressure irrigation,
irrigation using negative-pressure irrigation, and irrigation
using a nebulizer. For each subject, three-dimensional
computer reconstructions of the irrigated paranasal
sinus airspaces were used to compare contrast solution
volume and distribution achieved by the three methods.
Results:
Of the three methods used, two methods, positive-pressure
and negative-pressure irrigation, distributed contrast
solution widely to ethmoid and maxillary sinuses, but
distribution of contrast solution was more uniform using
positive-pressure irrigation than using negative-pressure
irrigation. The nebulization method distributed contrast
solution poorly and resulted in a significantly lower
volume of retained contrast solution (P <.05).
Conclusion:
Judged solely on the basis of solution distribution
in the nasal sinuses, nasal irrigation is effective
when either positive-pressure or negative-pressure irrigation
is used but is ineffective when a nebulizer is used.
Laryngoscope
2002 August;112(8):1394-1398
Copyright (c) 2002 The American Laryngological, Rhinological
and Otological Society, Inc.
All
rights reserved Published by Lippincott Williams &
Wilkins . Republished with permission.
A
nasal irrigator can be obtained from http://www.sinus-relief.com
Top
|
Cat
study. Early exposure to cats may help prevent allergies in
later life
Exposure
to Dogs and Cats in the First Year of Life and Risk of Allergic
Sensitization at 6 to 7 Years of Age. Abstract Contributed by
Murray Grossan MD
http://www.sinus-relief.com
Authors: Dennis R. Ownby, MD; Christine Cole Johnson, PhD; Edward
L. Peterson, PhD
Context:
Childhood asthma is strongly associated with allergic sensitization.
Studies have suggested that animal exposure during infancy
reduces Subsequent allergic sensitization.
Objective:
To evaluate the relationship between dog and cat exposure
in the first year of life and allergic sensitization at 6
to 7 years of age.
Design,
Setting, and Subjects Prospective birth cohort study of healthy,
full-term infants enrolled in a health maintenance organization
in suburban Detroit, Mich, who were born between April 15,
1987, and August 31, 1989,and followed up yearly to a mean
age of 6.7 years. Of 835 children initially in the study at
birth, 474 (57%) completed follow-up evaluations at age 6
to 7 years.
Main Outcome
Measures: Atopy, defined as any skin prick test positivity
to 6 common aeroallergens (dust mites (Dermatophagoides farinae,
D pteronyssinus),dog, cat, short ragweed (Ambrosia artemisiifolia),
and blue grass (Poa pratensis)); seroatopy, defined as any
positive allergen-specific IgE test result for the same 6
allergens or for Alternaria species.
Results
The prevalence of any skin prick test positivity (atopy) at
age 6 to 7 years was 33.6% with no dog or cat exposure in
the first year of life, 34.3% with exposure to 1 dog or cat,
and 15.4% with exposure to 2 or more dogs or cats (P = .005).
The prevalence of any positive allergen-specific IgE test
result (seroatopy) was 38.5% with no dog or cat exposure,
41.2% with exposure to 1 dog or cat, and 17.9% with exposure
to 2 or more dogs or cats (P = .003). After adjustment for
cord serum IgE concentration, sex, older siblings, parental
smoking, parental asthma, bedroom dust mite allergen levels
at 2 years, and current dog and cat ownership, exposure to
2 or more dogs or cats in the first year of life was associated
with a significantly lower risk of atopy (adjusted odds ratio,
0.23; 95% confidence interval, 0.09-0.60) and seroatopy (adjusted
odds ratio, 0.33; 95% confidence interval, >0.13-0.83).
Conclusion
Exposure to 2 or more dogs or cats in the first year of life
may reduce subsequent risk of allergic sensitization to multiple
allergens during childhood.
Author/Article
Information
Author Affiliations: Section of Allergy and Immunology, Department
of Pediatrics, Medical College of Georgia, Augusta (Dr Ownby);
Department of Biostatistics and Research Epidemiology, Henry
Ford Health System, Detroit, Mich (Drs Johnson and Peterson);
National Institute of Environmental Health Sciences Center
in Molecular and Cellular Toxicology with Human Applications,
Wayne State University, Detroit (Drs Johnson and Peterson).
Corresponding
Author and Reprints: Dennis R. Ownby, MD, Section of Allergy
and Immunology, Department of Pediatrics, BG-1019, Medical
College of Georgia, Augusta, GA 30912-3790 (e-mail: downby@mail.mcg.edu).
Top
|