Prognosis for most people who experience<unk>  is excellent as long-term complications and death are rare. Hospitalization is typically not required.<unk>  is usually self-limiting and symptoms resolve spontaneously within two weeks as the immune system clears the virus from the body. In high-risk groups such as immunocompromised persons, prognosis is considered to be the same as for other groups. For most people, infection leads to lifelong immunity against future infection. Reinfections appear to be more mild and atypical than the first infection. The overall case-fatality rate of<unk>  is 1.6–3.8 people per 10,000, and these deaths typically occur in those who develop encephalitis.<unk>  orchitis typically resolves within two weeks. In 20% of cases, the testicles may be tender for a few more weeks. Atrophy, or reduction of size, of the involved testicle occurs in 30–50% of orchitis cases, which may lead to abnormalities in sperm creation and fertility such as low sperm count, absence of sperm in semen, reduced sperm motility, reduced fertility (hypofertility) in 13% of cases, and rarely sterility. Hypofertility can, however, occur in cases without atrophy. Abnormalities in sperm creation can persist for months to years after recovery from the initial infection, the length of which increases as the severity of orchitis increases. Examination of these cases shows decreased testicular volume, tenderness of the testicles, and a feeling of inconsistency when handling the testicles. Infertility is linked to severe cases of orchitis affecting both testes followed by testicular atrophy, which may develop up to one year after the initial infection. Of bilateral orchitis cases, 30–87% experience infertility. There is a weak association between orchitis and later development of epididymitis and testicular tumors.<unk>  meningitis typically resolves within 3–10 days without long-term complications. In meningoencephalitis cases, higher protein levels in CSF and a lower CSF glucose to blood glucose ratio are associated with longer periods of hospitalization. Approximately 1% of those whose CNS is affected die from<unk> . Post-infectious encephalitis tends to be relatively mild, whereas post-infectious encephalomyelitis has a case-fatality rate of up to ten percent. Most cases of<unk>  deafness affect just one ear and are temporary, but permanent hearing loss occurs in 0.005% of infections. Myocarditis and pericarditis that occur as a result of<unk>  may lead to endocardial fibroelastosis, i.e. thickening of the endocardium. With extreme rarity, infertility and premature menopause have occurred as a result of<unk>  oophoritis.
Mumps
Chickenpox
Smallpox
Larva currens
Cowpox
Sealpox
Scabies
Malaise