| ascertainment of secondary cases of hepatitis a--kansas, 1996-1997. | each year, 25,000-30,000 cases of hepatitis a are reported in the united states. the most common infection source (22%-26%) is household or sexual contact with a person already infected with hepatitis a virus (hav) (i.e., the source-patient). in kansas during 1992-1997, contact with a source-patient was reported by 39% of persons with hepatitis a. cases reported in 1996 and 1997 were studied retrospectively to determine the reasons for the apparently high proportion of secondary cases and to eva ... | 1999 | 10428094 |