Many possibilities: From viruses, bacteria, fungi, parasites there are numerous organisms that can do this. They can get there through the oral cavity by ingestion, or by anal sex, occasionally by extension from the blood stream, etc.
Answered 8/4/2020
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8 doctors weighed in across 2 answers
7 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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