Viviana Sirven, M.D., who specializes in allergy, asthma and immunology poses for a photo at her clinic on 8200 SW 117 Ave., on Monday, June 25, 2012 in Miami, Fla. Sirven said about 40 percent of her elderly patients have asthma, which can be better treated with environmental control and medication. Max Reed / FOR THE MIAMI HERALD

Viviana Sirven, M.D., who specializes in allergy, asthma and immunology advises patient Janet Estarella during a pulminary function test at her clinic on 8200 SW 117 Ave., on Monday, June 25, 2012 in Miami, Fla. Sirven said about 40 percent of her elderly patients have asthma, which can be better treated with environmental control and medication. Max Reed / FOR THE MIAMI HERALD

Viviana Sirven, M.D., who specializes in allergy, asthma and immunology holds an allergy test tray at her clinic on 8200 SW 117 Ave., on Monday, June 25, 2012 in Miami, Fla. Sirven said about 40 percent of her elderly patients have asthma, which can be better treated with environmental control and medication. Max Reed / FOR THE MIAMI HERALD

Viviana Sirven, M.D., specializes in allergy, asthma and immunology. Max Reed / For The Miami Herald