Which infection has the most levels of parasitism? We can come up with Salmon Poisoning disease an illness lethal in (1) dogs and their relatives who ate (2) a salmon or other fish infected with (3) a fluke that developed in (4) a river snail and carried (5) a rickettsia, Neorickettsia heliminthoeca that causes the symptoms of the disease. That’s five levels by our count. Six, if the rickettsia were to carry a virulence-related phage.
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