allergy sneezing womanKENTUCKY (3/4/14) — It is estimated that 45 million people in the US suffer from allergies.

Do you suffer from pet allergies? What about pollen?

A new study reveals it is what, not who, that determines allergies.

Scientists discovered allergies have more to do with the environment, not a specific trigger.

In the largest, most comprehensive, nationwide study to examine the prevalence of allergies from early childhood to old age, scientists from the National Institutes of Health report that allergy prevalence is the same across different regions of the United States, except in children 5 years and younger.

“Before this study, if you would have asked 10 allergy specialists if allergy prevalence varied depending on where people live, all 10 of them would have said yes, because allergen exposures tend to be more common in certain regions of the U.S.,” said Darryl Zeldin, M.D., scientific director of the National Institute of Environmental Health Sciences part of NIH.

“This study suggests that people prone to developing allergies are going to develop an allergy to whatever is in their environment. It’s what people become allergic to that differs." — Darryl Zeldin, M.D.

The research appeared online in February in the Journal of Allergy and Clinical Immunology, and is the result of analyses performed on blood serum data compiled from approximately 10,000 Americans in the National Health and Nutrition Examination Survey 2005-2006.

Although the study found that the overall prevalence of allergies did not differ between regions, researchers discovered that one group of participants did exhibit a regional response to allergens.

Among children aged 1-5, those from the southern U.S. displayed a higher prevalence of allergies than their peers living in other U.S. regions.

These southern states included Texas, Oklahoma, Louisiana, Arkansas, Tennessee, Kentucky, Mississippi, Alabama, Georgia, West Virginia, Virginia, North Carolina, South Carolina, and Florida.

“The higher allergy prevalence among the youngest children in southern states seemed to be attributable to dust mites and cockroaches,” explained Paivi Salo, Ph.D., an epidemiologist in Zeldin’s research group and lead author on the paper. “As children get older, both indoor and outdoor allergies become more common, and the difference in the overall prevalence of allergies fades away.”

The scientists determined risk factors that made a person more likely to be allergic.

  • The study found that in the 6 years and older group, males, non-Hispanic blacks, and those who avoided pets had an increased chance of having allergen-specific IgE antibodies, the common hallmark of allergies.
  • Socioeconomic status did not predict allergies, but people in higher SES groups were more commonly allergic to dogs and cats, whereas those in lower SES groups were more commonly allergic to shrimp and cockroaches.

By generating a more complete picture of U.S. allergen sensitivity, the team uncovered regional differences in the prevalence of specific types of allergies.

  • Sensitization to indoor allergens was more prevalent in the South.
  • Sensitivity to outdoor allergens was more common in the West.
  • Food allergies among those 6 years and older were also highest in the South.


If you suffer from allergies, follow these tips:

  • Before heading outdoors, check with local website for pollen count. Search by zipcode, focus on time of day and date, or go to Pollen.com.
  • Exercise indoors on high pollen count days, or mid day when pollen count is lowest.
  • Change clothes and shower after exercising outdoors. Pollen can stick to clothes, skin and hair.
  • Consult your doctor if you suffer from severe allergies.
For more information on environmental health topics, visit National Institute of Environmental Health Sciences.

SurfKY News
Information provided by National Institute of Health

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