কারণ যেভাবে এটা ছড়ায় ,হেপাটাইটিস এ ভাইরাসের মহামারীর আকারে প্রকাশের প্রবণতা থাকে।
As many as 1 in 3 people in the United States have antibody to HAV, meaning they have been exposed to the virus, but most do not become ill. The number of cases of hepatitis A in the United States varies among different communities and has not been affected significantly by the introduction of the hepatitis A vaccine since the early 1990s.