Infectious diseases

Infectious diseases are diseases caused by bacteria, viruses, parasites or fungi. Some microorganisms are harmless and helpful, but under certain conditions it causes disease. Infectious diseases can be transmitted from one another or by insects or animal bites. Where as some can be transmitted by contaminated food or water. Symptoms and signs vary depending on the cause of infection, but common symptoms include fever and fatigue. Some infectious diseases like measles and chickenpox can be prevented by vaccines.

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