Description - Disaster Science: Science of a Pandemic by Robin Koontz
Contagious diseases spread from one human to another because people come into close contact with each other. When this happens, viruses move from one host to another. the viruses that cause diseases such as influenza, measles, and tuberculosis are spread through the air. Touching someone who is ill, or something that they touched, can also spread a disease. Another way people become infected by viruses is by living close to insect or animal vectors. A vector is a living thing that transmits disease to another living thing.
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