Mouth or mouth related liquid may have a lot of micro-organisms, which may causes diseases in the host, as well as in others exposed with mouth contacted “dirty” food.

There was a case of oral transmission of HIV-1 in a couple.

CERTAINLY 肝炎HBV, HCV MAY BE TRANSMITTED 传染 THROUGH MOUTH BLOOD口中血 (ULCERS溃疡, DEEP CAVITIES蛀牙, ETC)， 导致肝癌。第一肝癌大国很大成度就是这些生物战者造成。国家应立法除之。应兴文明之风。

烟雾应是肺癌大国的首因。 历史History said that already.

INTENTIONALLY TO EXPOSE OTHERS TO ONE’S DIRTY MOUTH CONTENT SHOULD BE SUBJECT TO PUNISHMENT TO AN EXTEND TO ALL THE WAY YOU WANTED TO DO. WAR USE BIOLOGICAL/CHEMICAL HAVE BEEN BANNED BY THE WORLD.