細菌和病毒有什麼分別?

病毒是細菌中只其中一小類,大部份細菌其實是無毒害的:例如益生菌

細菌 is bacteria while 病毒 is viruses
viruses need a host cell otherwise they will die
viruses is absolutely harmful to human ,but bacteria sometimes help us defend
against other diseases.
viruses will die when they contact with air since they are made form protein which easily denatured in air.

2006-11-25 18:48:10 補充：
第一位朋友既concept 錯左細菌 唔會變成 病毒細菌 有 nucleus 病毒 都無ge咁都變

簡單來說，
細菌就是會變成病毒，
令我們生病，
老實說是沒有多大分別。