Question

are the microorganisms that causes disease

Answer 1

A variety of microorganisms can cause disease. Pathogenic organisms are of five main types:viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right. Infectious agents can grow in various body compartments, as shown schematically in fig.

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Answer 2

bacteria , viruses and protozoa
disease causing microbes can also be called as pathogen , germs or bugs

...are responsible for causing infection diseases