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.
Hepatitis B. Hepatitis B is a highly contagious disease that can range in severity from a mild illness lasting a few weeks to a serious, lifelong illness. Hepatitis B infection can occur through sexual contact or sharing needles / syringes.