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The best answer i can find are Protozoa Ricketts
Although Ricketts are a disease, ever source i can find claims it's the answer.
Parasites are among the infectious agents. The parasites are the Protozoa and Chlamydia.
What is a parasite?
A parasite is an organism that obtains its food from another organism but harms the orgamism in return. Parasites are among the classes of infectious agents.
Among the organisms listed, the parasites are the Protozoa and Chlamydia.
Learn more about parasites: https://brainly.com/question/4822356