title: Lymphocyte blastogenic responses to L. pneumophila in acute Legionellosis.
abstract: Thirteen patients with acute Legionellosis were studied. Acute serologic studies obtained within the first two weeks of illness were non-diagnostic in 10 of 13 cases. Lymphocyte blastogenic responses to sonicated L. pneumophila were much higher in patients with acute disease (mean net cpm +/- SEM = 66,786 +/- 15,428) than in subjects without a history of Legionellosis (11,800 +/- 1,760) p less than 0.01. Eleven of the 13 patients with acute Legionellosis had net cpm greater than 17,000. Lymphocytes from six patients with acute non-Legionnaires' pneumonia had mean cpm of 3,769 +/- 909 (p less than 0.01). Blastogenic response to L. pneumophila appears to occur earlier than the production of measurable antibody and may be a useful adjunct to diagnosis.
mesh_terms: D000328:Adult; D000368:Aged; D000942:Antigens, Bacterial; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D007875:Legionella / Q000276:immunology*; D007877:Legionnaires' Disease / Q000175:diagnosis / Q000276:immunology*; D008213:Lymphocyte Activation; D008297:Male; D008875:Middle Aged; D013997:Time Factors
chemical_list: D000942:Antigens, Bacterial