hepatitis A

Hepatitis A is caused by a picornavirus usually transmitted by the fecal-oral route in a manner similar to that of poliovirus. Hepatitis B is caused by a small DNA virus that contains its own DNA polymerase and is transmitted by transfusion of blood and other blood…

…of being ill, since their disease remains asymptomatic or quite mild. The incubation period of HAV infections, from viral ingestion to the onset of symptoms, averages four to five weeks. Acute illness in an otherwise healthy pregnant woman does not appear to have adverse effects upon the fetus. Persons can…

…Administration (FDA), which approved another hepatitis A vaccine, Vaqta, the following year; both were recommended for individuals ages 12 months and older. A combination vaccine for protection against both hepatitis A and hepatitis B (Twinrix) was later made available for adults ages 18 and older. All three vaccines are highly…

…main forms of the disease, hepatitis A and hepatitis B, occur in children. These two forms were distinguished initially by their clinical characteristics and are now recognized to be caused by two different viruses. Hepatitis A (infectious hepatitis) is highly contagious and can be passed from person to person directly,…

…and for the prevention of hepatitis A and hepatitis B viral infections, measles, chickenpox, rubella, and polio.

Hepatitis A, caused by the hepatitis A virus (HAV), is the most common worldwide. It is considered an acute infection and does not give rise to chronic hepatitis. Its onset usually occurs 15 to 45 days after exposure to the virus, and some…