Date:12/23/2009

mation that there's a genetic contribution to asthma," said Dr. Len Horovitz, a pulmonary specialist with Lenox Hill Hospital in New York City. "But you can have a genetic tendency and never express it. If you knew this about a person, you would watch them more carefully, want them to be less exposed to secondhand smoke that might bring out asthma. But that wouldn't guarantee that they would or wouldn't express asthma. That probably is something more complicated that has to do with other environmental factors."

More information

There's more on childhood asthma at the American Academy of Asthma, Allergy & Immunology.

SOURCES: Norman Edelman, M.D., chief medical officer, American Lung Association; Hakon Hakonarson, M.D., Ph.D., director, Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia; Len Horovitz, M.D., pulmonary specialist, Lenox Hill Hospital, New York City; early online release, Jan. 7, 2009 New England Journal of Medicine

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