Hidden infections are actually very common and can be the underlying root cause of: By hidden infection I mean a chronic, silent, underlying infection deep in your body. (drcarri.com)
These range from getting sleep to fixing and getting rid of underlying infections like Lyme, yeast, or viruses. (treatlyme.net)
The mechanism may also underlie infections caused by some parasites, including Giardia, which causes intestinal illness, and Leishmania, which causes skin sores, organ damage, and anemia, he says. (sciencemag.org)