
If you have questions about the conjugation of пневмоцистоз or Russian nouns in general, you can practice and get feedback from a professional tutor.
Но у него пневмоцистоз, безобидные микробы, которые повсюду, но от которых никто не заболевает.
But he has pneumocystis, a harmless bug that's everywhere and never makes anyone sick, unless they have a compromised immune system.