Well considering primates Eat what they groom from another they obviously ingest microbes and viruses from another primate as they groom them. I don't recall this activity occuring with modern humans since soap and water was invented or earlier when olive oil and strygals were used to scrape dirt off of other humans in Roman baths. Attempting to connect microbiomes within Primates because of mere "connectedness" without adding this ingestion process is disingenuous especially if trying to also connect this with microbiomes and "connectedness" among humans.