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A review was conducted to examine the published works that studied the prevalence of Pneumocystis jirovecii dihydropteroate synthase (DHPS) mutations in patients with P. jirovecii pneumonia (PcP), in develop and developing countries, and that focused the problem of the possible association of these mutations with exposure to sulpha or sulphone drugs and their influence in the PcP outcome. Studies conducted in United States of America presented higher P. jirovecii mutations rates, in comparison with European countries, and in developing countries, lower rates of DHPS mutations were reported, due to limited use of sulpha drugs. A significant association was reported between the use of sulpha or sulphone agents for PcP prophylaxis in HIV-infected patients and the presence of DHPS mutations. However these mutations were also detected in PcP patients who were not currently receiving sulpha or sulphone agents. The outcome and mortality of HIV-infected patients with PcP harbouring DHPS gene mutations were related primarily to the underlying severity of illness and the initial severity of PcP, more than to the presence of mutations.

Epidemiology and clinical relevanceofPneumocystis jiroveciiFrenkel, 1976 dihydropteroate synthase gene mutations