<unk>  is a common childhood infection usually with minimal systemic upset although transient arthropathy may occur in adults. Serious complications are very rare. If it were not for the effects of transplacental infection on the developing fetus,<unk>  is a relatively trivial infection.
Rubella
Ebola
Polio
Smallpox
Mumps
Tularemia
Man flu
Roseola 