Subclinical

... E.g tuberculosis can often be a chronic infection lasting for decades (although if the infection causes no visible symptoms, it is often called subclinical). A bacterial pneumonia, on the other hand, is a usually a typical acute infection: a quick onset with clear symptoms and lasts for a limited ...

See entire post

... chronic diseases such as Gulf War syndrome, fibromyalgia, MCS, rheumatoid arthritis, and other autoimmune diseases may be partly caused by these "subclinical" infections by organisms heretofore considered to be harmless. Immune responses in farm workers after exposure to Bacillus thuringiensis ...

See entire post