ALI_EN: to nevim, doufam ze mym detem se to vyhne
KOCOURMIKES:
https://emedicine.medscape.com/article/964662-overview#a6
Most acute HBV infections in the United States occur among young adults, although about one third of patients acquire chronic infections through perinatal and early childhood exposures. The prevalence increases with age. The age at infection primarily determines the rate of progression from acute infection to chronic infection, which is approximately 90% in the perinatal period, 20-50% in children aged 1-5 years, and less than 5% in adults
The virus is present in all body fluids, except stool. Blood and body fluids are the primary vehicles of transmission; the virus may also spread by contact with body secretions, such as saliva, sweat, tears, breast milk, semen, and pathologic effusions.
Modes of transmission are the same as for the human immunodeficiency virus (HIV), but HBV is 50-100 times more infectious. Unlike HIV, HBV can survive outside the body for at least 7 days. During that time, the virus can still cause infection if it enters the body of a person who is not infected.