<unk>  is transmitted primarily by respiratory secretions (saliva, mucus, etc.), but can also be spread by contact with infected blood. The incubation period (the time between the initial infection and the onset of symptoms) is usually between 4 and 21 days. Individuals with<unk>  are most infectious before the onset of symptoms. Typically, school children, day-care workers, teachers, and parents are most likely to be exposed to the virus. When symptoms are evident, the risk of transmission is small; therefore, symptomatic individuals do not need to be isolated. Vertical transmission from maternal infection may also occur, which can lead to hydrops fetalis due to the infection's detrimental effects on red blood cell production.
Fifth disease
Cancer cluster
On the Sacred Disease
Preiser disease
Juven
Murder
The Fountain of Age
Pre-medical