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What are the main causes of epidemics?

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Forty years ago, a patient exhibiting symptoms believed to be from malaria sought treatment in a small village in the Republic of the Congo in Africa. read more

An epidemic of non-existent disease in that area is unlike to be seen after such disasters. iii) Ecological Changes. During natural disaster like floods and cyclones, ecological changes occur. It causes increase in the breeding sites for mosquitoes. This results in an increase in the cases of malaria. read more

Disease and epidemics occur as a result of the interaction of three factors, agent, host, and environment. Agents cause the disease, hosts are susceptible to it, and environmental conditions permit host exposure to the agent. read more

Philadelphia was once the nation’s capital and its busiest port. One humid summer, refugees leaving a yellow fever epidemic in the Caribbean Islands sailed in, carrying the virus with them. Yellow fever causes yellowing of the skin, fever, and bloody vomiting. Five thousand people died, and 17,000 fled the city. read more

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