Question category: Tropical medicine
A 33 year old male with HIV presents unwell. He has a cough productive of green sputum, is short of breath and is pyrexial. He is noticed to desaturate on minimal exertion. On examination there is a few crackles bibasally. A chest X ray reveal perihilar bilateral diffuse infiltrates. Which of the following should be utilised for prophylaxis to prevent the development of this infection?