A cikin ƙwayoyin cuta, ƙwayoyin cuta na iya shiga cikin huhu ta hanyar gurɓataccen iska mai gurɓataccen iska. Kwayoyin cuta na iya yaduwa ta hanyar jini. Da zarar a cikin huhu, ƙwayoyin cuta na iya mamaye sararin samaniya tsakanin ƙwayoyin cuta da tsakanin alveoli, inda macrophages da neutrophils (ƙwayoyin farin jini masu kariya) ke ƙoƙarin kashe ƙwayoyin cuta. Neutrophils kuma suna sakin cytokines, suna haifar da kunnawa gaba ɗaya na tsarin garkuwar jiki. Wannan yana haifar da zazzabi, da gajiya na yau da kullun a cikin ƙwayoyin cuta. Kwayoyin cuta daga ƙwayoyin cuta na iya tafiya daga huhu ta hanyar gurɓataccen iska mai gurɓataccen iska. Tambaya: Ta yaya ƙwayoyin cuta daga ƙwayoyin cuta na iya zuwa ƙwayoyin cuta?
ta hanyar jini