There are four main types of air pollution sources: mobile sources â such as cars, buses, planes, trucks, and trains stationary sources â such as power plants, oil refineries, industrial facilities, and factories
Incubation Period: Average 9-10 days. Period of Communicability: Highly communicable in the early phase and at the beginning of the paroxysmal cough stage (first 2 weeks). The child is no longer contagious after 5 days of treatment.
5. Get help from a doctor now âº. Flu: The contagious period generally is from one day before onset of symptoms/illness until 24 hours after fever has resolved. Once past that point, you are no longer infectious to others.