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What causes infection and diseases?

User Tywan
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Answer: Infections are caused by germs that enter the body, multiply, and cause harm or illness.

Explanation: The main types of germs that can cause infections are Bacteria and Viruses.

User Cucurbit
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Answer:

Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi; the diseases can be spread, directly or indirectly, from one person to another. Zoonotic diseases are infectious diseases of animals that can cause disease when transmitted to humans.

Step-by-step explanation:

User Gapton
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