Tyagi AK, Mirdha BR, Luthra K, Guleria R, Mohan A, Singh UB, Samantaray JC, Dar L, Iyer VK, Chaudhry R (2010) Dihydropteroate synthase (DHPS) gene mutation study in HIV-Infected Indian patients with Pneumocystis jirovecii pneumonia. J Infect Dev Ctries 4:761–766. doi: 10.3855/jidc.914