Phukusi lililonse limaphatikizanso mabakiteriya a alumali, komanso zida zomangira zamtundu wapamwamba kwambiri kuti zitsimikizire kuyika kotetezeka komanso kolimba. Zida zathu za nangula zimaphatikizapo zomangira, anangula apakhoma, zosungira zobiriwira zomangira ndi zomangira mashelufu.