Question

What are infectious diseases ???
What are the different categories of infectious agents...??

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Answer 1

Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful, but under certain conditions, some organisms may cause disease. Some infectious diseases can be passed from person to person.

There are five major types of infectious agents: bacteria, viruses, fungi, protozoa, and helminths. In addition, a new class of infectious agents, the prions, has recently been recognized. A brief review of the general characteristics of each of these agents and examples of some diseases they cause follows.

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Answer 2

An infectious disease is an illness caused by a microbe – an organism too small to be seen with the naked eye. Bacteria, virus, fungi and protozoa are all disease-causing microbes.

the different categories of infectious agents are

Bacteria, viruses, fungi, protozoa, parasites, and prions are different types of pathogen. They vary in their size, shape, function, genetic content, and how they act on the body.  

For example, viruses are smaller than bacteria, and they can enter a host and take over cells. However, bacteria can survive without a host.