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They are called pathogens.
The disease causing microbes are called pathogens.
Well, an expert on animals is called a zoologist, and a plant expert is called a botanist.
pathogens
Prions are the smallest pathogens
Felinology is the study of cats, so a cat expert is called a felinologist.
Asepsis means the absence of pathogens
They are called "bacterial pathogens".
pathogens
Viruses, bacteria, and so on are called germs, infective agents, microbes, pathogens and so forth.
pathogens
They are called as pathogens.