Los autores, del National Jewish Medical and Research Center de Denver (Estados Unidos), compararon un grupo de 55 pacientes con asma crónica estable con 11 controles sanos y observaron que 25 de los pacientes asmáticos presentaban infección crónica por patógenos de la especie Mycoplasma por sólo uno de los controles. Siete de los pacientes con asma estaban infectados por especies de Chlamydia, por ninguno de los voluntarios sanos.
En cifras, el 56,4% de los asmáticos crónicos dio positivo a alguno de estos agentes patógenos.
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