Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Yawancin ƙwayoyin cuta suna shiga cikin huhu ta hanyar ƙananan ƙwayoyin halitta da ke zaune a cikin makogwaro ko hanci. Rabin mutanen da suke da lafiya suna da waɗannan ƙananan burin yayin barci. Ko da yake kullum ƙwayoyin cuta suna cikin makogwaro, ƙwayoyin cuta da za su iya kamuwa da cuta suna kasancewa a wurin ne kawai a wasu lokatai kuma a ƙarƙashin wasu yanayi. Ƙananan nau'ikan ƙwayoyin cuta kamar Mycobacterium tarin fuka da Legionella pneumophila sun isa huhu ta hanyar gurɓataccen iska mai iska. Kwayoyin za su iya yaduwa ta hanyar jini. Da zarar sun shiga cikin huhu, ƙwayoyin cuta za su iya shiga tsakanin ƙwayoyin cuta da kuma tsakanin alveoli, inda macrophages da neutrophils (farin ƙwayoyin jini masu kariya) suke ƙoƙarin kashe ƙwayoyin cuta. Neutrophils kuma suna sakin cytokines, wanda ke haifar da kunna tsarin garkuwar jiki gaba ɗaya. Wannan yana haifar da zazzabi, sanyi, da gajiya na yau da kullun a cikin ciwon huhu na kwayar cuta. Neutrophils, kwayoyin cuta, da ruwa daga jijiyoyin jini da ke kewaye da su suna cika alveoli, wanda ke haifar da ƙarfafawa da aka gani a kan X-ray na kirji.  Tambaya: Menene ke faruwa sa'ad da ƙwayoyin cuta suka shiga yankin da ke tsakanin alveoli da ƙwayoyin cuta a cikin huhu?
macrophages da neutrophils (farin ƙwayoyin jini masu kariya) suna ƙoƙarin kashe ƙwayoyin cuta