Quote:
The mumps are caused by a paramyxovirus, and are spread from person to person by saliva droplets or direct contact with articles that have been contaminated with infected saliva. The parotid glands (the salivary glands between the ear and the jaw) are usually involved. Unvaccinated children between the ages of 2 and 12 are most commonly infected, but the infection can occur in other age groups. Orchitis (swelling of the testes) occurs in 10–20% of infected males, but sterility only rarely ensues; a viral meningitis occurs in about 5% of those infected. In older people, the central nervous system, the pancreas, the prostate, the breasts, and other organs may be involved.
The incubation period is usually 18 to 21 days, but may range from as few as 12 to as many as 35 days. Mumps is generally a mild illness in children in developed countries. After adolescence, mumps tends to affect the ovary, causing oophoritis, and the testes, causing orchitis. The mature testis is particularly susceptible to damage from mumps which can lead to infertility. Adults infected with mumps are more likely to develop severe symptoms and complications.
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here. SG, it sounds to me like like your mom was trying to have your brother get the mumps when he was young and it wasn't very harmful. Because if he didn't, and he got them when he was older, it could make him sterile. At least that is how I read it. I have never had measles, mumps or german measles. I was vaccinated for all. I did have chicken pox though... no fun at all.