| sequential changes in hepatitis a virus genotype distribution in estonia during 1994 to 2001. | hepatitis a virus (hav) isolates from a large outbreak and from non-outbreak cases in estonia were characterized by sequencing the aminoterminal vp1 region. from january 1998 to december 1999, a total of 1084 cases of hepatitis a were reported to the harjumaa-tallinn and ida-virumaa health protection services in estonia. the attack rate was highest among males aged 15-29. initial cases were noted to be associated with injecting drug use. igm anti-hav positive sera were available from 107 hospita ... | 2003 | 12696104 |