Legionnaires' disease Legion convention in 1976 was high (29 deaths in 182 infected individuals) because the antibiotics used (including penicillins, cephalosporins, and aminoglycosides) had poor intracellular penetration. Mortality has plunged to less than 5% if therapy is started quickly. Delay in giving the appropriate antibiotic leads to higher mortality. The fatality rate of Legionnaires' disease has ranged from 5 to 30% during various outbreaks and approaches 50% for nosocomial infections, especially when treatment with antibiotics is delayed. Hospital-acquired "Legionella" pneumonia has a fatality rate of 28%, and the principal source of infection in such cases is the drinking-water distribution system. Legionnaires' disease
Pneumocystis pneumonia The older species name "Pneumocystis carinii" (which now applies only to the "Pneumocystis" species that is found in rats) is still in common usage. As a result, "Pneumocystis" pneumonia (PCP) is also known as Pneumocystis jiroveci[i]" pneumonia and (incorrectly) as Pneumocystis carinii" pneumonia. Regarding nomenclature, when the name of "Pneumocystis" pneumonia (PCP) changed from "P. carinii" pneumonia to "P. jirovecii" pneumonia, it was at first asked whether "PJP" should replace "PCP". However, because the short name "PCP" was already well established among physicians that managed patients with "Pneumocystis" infection, it was widely accepted that that name could continue to be