Christopher C. Chang
Christopher C. Chang, M.D., Ph.D, Nemours/Alfred I. duPont Hospital for Children, Jefferson Medical Colg
Children born outside the United States have significantly lower odds of developing allergic disorders, including asthma, eczema, hay fever, and food allergies, according to a recent study in JAMA Pediatrics.
The study also found kids born outside the U.S. who lived in the U.S. for longer than 10 years when compared with those who resided for only 0 to 2 years had significantly higher odds of developing any allergic disorders, including eczema and hay fever, but not asthma or food allergies.
For the study, researchers at St. Luke's-Roosevelt Hospital Center in New York City examined data from the National Survey of Children's Health, a group of more than 91,600 children between the ages of 0 and 16 who have been tracked since 2007-2008.
Christopher C. Chang, M.D., Ph.D, Nemours/Alfred I. duPont Hospital for Children, Jefferson Medical Colg
It’s time to dispel some allergy myths that I often encounter:
Hypoallergenic dogs. Is your child allergic to dogs, but really wants one as a pet? Unfortunately, there is no such thing as a hypoallergenic dog. At some point the notion was put forth, possibly by dog breeders, that certain short-haired breeds were hypoallergenic because they had hair, not fur. Another perpetrated myth is that you can become sensitized and therefore not allergic to your own pet, while still having symptoms when you’re around other dogs.
There is no evidence to support either of these theories. The proteins that cause people to react to dogs are present in all dogs, albeit possibly in varying amounts. If you do become tolerant to these proteins where you no longer have symptoms, your tolerance will be to all, not just one or some dogs. Some breeds do exhibit slightly more allergenic response on analysis, but it’s not a very significant difference compared to other dogs.
Christopher C. Chang, M.D., Ph.D, Nemours/Alfred I. duPont Hospital for Children, Jefferson Medical Colg
Has your child ever told you that certain foods cause tingling and itching in and around the mouth and the back of the throat? Does this occur within minutes of eating the food?
If your child also has seasonal allergies, it’s likely that this reaction is oral allergy syndrome. These symptoms occur because the proteins in some fruits and vegetables are similar to proteins in some pollens. These proteins can confuse the immune system and cause an allergic reaction or make existing symptoms worse.
People who are allergic to any type of pollen have a 50 percent chance of developing oral allergy syndrome. One of the most common types of cross-reactivity involves birch tree pollen and apple. Other food triggers associated with this pollen include peach, pear, kiwi, plum, coriander, fennel, parsley, celery, cherry and carrot. When one makes antibodies to the pollen, they also become sensitized to these fruits and vegetables. The Philadelphia area has an abundance of birch pollen and oral allergy syndrome is quite common here.
Christopher C. Chang, MD, PhD
Sensitivity to mold is similar to pollen allergies and affects both adults and children. While allergies associated with outdoor mold spores peak in warm weather, indoor mold can pose problems year round.
Mold is another name for fungi – unsightly patches of brown, black, green, or yellow fuzzy growths. Mold, unwanted and usually unpleasant, is associated with damp basements, walls and carpets, dirty bathroom grout and musty smells. But without mold, we wouldn’t have penicillin, blue cheese, bread, beer, wine or edible mushrooms! In other words, mold isn’t all bad.
Most people, no matter where they live, are exposed to mold to some degree. Dampness and humidity provide the perfect breeding ground for mold. Mold is fairly ubiquitous, thriving on dampness virtually anywhere. To demonstrate an allergy, you must first be exposed and sensitized to the allergenic substance.
Christopher C. Chang, MD, PhD
By Christopher C. Chang, M.D., Ph.D.
A lot of children experience wheezing in response to weather conditions, allergens, air quality and exercise. For those who live in cities and industrial areas, the prevalence of wheezing and asthma increases. Big cities such as Philadelphia have air quality problems – all one has to do is drive down I-95 flanked by smokestacks with different colored gases pouring out of them to see evidence of air pollution. According to the American Academy of Pediatrics, children and infants are among the most susceptible to many air pollutants.
There are several pollutants that are deemed to be sufficiently hazardous to humans to merit their measurement by the Environmental Protection Agency (EPA). They include ozone, sulfur dioxide, nitrogen dioxides, carbon monoxide, particulate matters, and lead. Particulate matter varies in size. Those that are less than 2.5 micrometers in diameter are known as fine particles. Scientists have linked fine particle pollution with significant health problems, including aggravated asthma, decreased lung function and difficulty breathing. Although air pollution doesn’t necessarily cause asthma (this is still controversial), it can be a factor in making symptoms much worse.
Christopher C. Chang, MD, PhD
A skin rash…itching…breathing problems…swelling. These can be warning signs that your child is having an allergic reaction to a medication he or she is taking. Some reactions -- like difficulty breathing, hives, fainting, dizziness or abdominal pain -- are a medical emergency that require a call to 9-1-1 and immediate action. But other times, drug reactions aren’t true allergies (in one Canadian study, just one in four reactions to antibiotics in children were allergies) -- but how can a parent tell the difference?
In this post, Healthy Kids expert panelist Christopher C. Chang, MD, PhD, of Nemours/Alfred I. duPont Hospital for Children explains the basics.
By Christopher C. Chang, MD, PhD
Christopher C. Chang, M.D., Ph.D.
by Christopher C. Chang, M.D., Ph.D.
Editor’s note: Six million American kids have food allergies - and studies show that up to 18 percent of them have had a reaction to a food eaten at school. How can you keep your kid safe and stop worrying? Allergy expert Christopher C. Chang, M.D., Ph.D. of Nemours/Alfred I. duPont Hospital for Children has this advice.
Imagine your child bites into a French fry, only to feel that familiar upset stomach and itching sensation begin – a typical allergic reaction. You know she’s allergic to fish, but this is a potato! As it happens, the French fries had been cooked on the same equipment that was used to fry fish.
Christopher C. Chang, M.D., Ph.D.
by Christopher C. Chang, M.D., Ph.D.
Your daughter pets a bunny and you notice her eyes get puffy. Your son eats shrimp dip and later complains of an itching sensation in his throat. Is it an allergy? Maybe, maybe not. In order to be certain, we perform allergy tests.
Rashes and hives worry parents. We look for triggers in substances which may have been ingested, inhaled or that have come in contact with the skin. When the culprit is poison ivy, for example, it is obvious and there’s no need to test for it. But environmental and especially food allergies can cause a variety of reactions, from the mild cases to full-blown life-threatening anaphylaxis. That is why it is a good idea to proceed with testing when allergies are suspected.
Christopher C. Chang, M.D., Ph.D.
by Christopher C. Chang, M.D., Ph.D.
We all look forward to enjoying summer’s bounty of fresh fruits and vegetables at the peak of the season. However, for some of us, fruits and veggies can cause allergic reactions ranging from hives and swelling of the skin to irritation of the mouth and throat. Some of the most common fruit allergies include melons, apples, strawberries and bananas.
What parents can do: Once you know a child is allergic to these foods, avoidance is the only reliable treatment. But if you’re not sure there has been a reaction, skin-prick test or a blood test may be helpful. After all, we want kids to enjoy these healthy foodsif they can indeed tolerate them.
Christopher C. Chang, M.D.
by Christopher C. Chang, M.D.
In the summertime, our region is abundant with stinging insects including apis (e.g. honeybees), vespids (e.g. yellow jackets, wasps and hornets) and formicids (e.g. fire ants). Stings from all of these species can cause a variety of reactions, ranging from local reactions such as pain, swelling and redness at the site of the sting, to full-blown anaphylaxis–life-threatening swelling of tissue in the mouth and throat that can block airways.
For the majority of kids and adults, a bee or wasp sting is just a nuisance. But for others, a more serious reaction can occur due to the toxin in the venom or an allergic reaction to the sting. Here’s how to avoid stings – and how to react if a child (or adult) with you has a troubling reaction.
