Original conceal takes the advantage of empty in the virus of nose pharynx ministry, bacteria and enter, many breed rises, cause a cold or cause bronchitic wait for a disease.

• 原来潜伏在鼻咽部的病毒、病菌就趁虚而入，并大量繁殖起来，引起感冒或诱发支气管炎等疾病。