The incubation period is the period of time during which the body is infected with a virus, bacteria or other disease that does not show symptoms immediately on the first day of infection and only slowly begins to show symptoms after a period of time. The period of time without the onset of symptoms is generally known as the incubation period, for example, the most common common cold, whether it is a viral or bacterial infection, the general incubation period is about 3-7 days. In addition, if the wound is traumatic, the incubation period of tetanus infection is about 1-2 weeks. The longest incubation period is rabies virus, rabies if a dog bite, it is likely that the incubation period in 1-3 months, some patients up to 1 year or even several years.