| inapparent infection of hepatitis a virus. | to detect inapparent infection with hepatitis a virus, serial sera were collected from patients with hepatitis a and their contacts in two waterborne epidemics in china. epidemic 1 occurred in a rural village near hangzhou during august 1978-january 1979, and epidemic 2 took place in a rural primary school in pinghu county in zhejiang in april-may 1985. these sera were tested for antibodies against hepatitis a virus (anti-hav), serum glutamic pyruvic transaminase (sgpt) activity, and icteric ind ... | 1988 | 2829622 |