<unk>  virus specific IgM antibodies are present in people recently infected by<unk>  virus, but these antibodies can persist for over a year, and a positive test result needs to be interpreted with caution. The presence of these antibodies along with, or a short time after, the characteristic rash confirms the diagnosis.
Rubella
Roseola
Ebola
Spanish flu
Polio
Hong Kong flu
Smallpox
Mumps