Why are infectious diseases are very common?

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Solution

Infectious diseases:
Infectious diseases are said to be diseases caused by various pathogenic microorganisms such as viruses, bacteria, protozoans, fungi, and several other parasites.
These infectious diseases are very common as they can be transmitted by animals, humans, insects, or other agents.
Disease Pathogen
Typhoid Bacteria
Common cold Virus
Influenza Virus
Cholera Bacteria
Elephantiasis worms
Kalaazar protozoa

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