RESUMEN
<p><b>OBJECTIVE</b>To investigate the seroprevalence of hepatitis viruses in human population of Ganso province.</p><p><b>METHODS</b>ELISA was used for detecting anti-HAY IgG, HBsAg/HBsAb, anti-HCV IgG and anti-HEV IgG of the serum samples. All sample were collected in four areas of KL, LT, HN and ZhL of Gansu province in 2008.</p><p><b>RESULTS</b>1977 samples were detected, The positive rates of anti-HAY, HBsAg/HBsAh, anti-HCV, and anti-HEY are 84.57% (1672/1977), 4.81% (95/1977) and 28.73% (568/1977), 0.46% (9/1977),and 13.10% (259/1977), respectively. The positive rate at different age group, for anti-HAY was 43.21% of c 9 years old, 80.23% of 10-19 years old, 93.02% of 20-29 years old, 95.55% of 30-39 years old, 95.60%-97.52% of 40-60 years old. For HBsAg/HBsAb were 2.09% or 29.27%, 3.02% or 21.81%, 6.20% or 36.43%, 5.93% or 31.16%, 6.43% or 3l.43%, 7.32% or 24.88%, 3.33% or 28.89% at the same age group, respectively, for anti-HCV, was 0.59% of 30-39 years old, 1.79% of 40-49 years old, 0.98% of 50-59 years old. For HEY-IgG was 3.48% of < or =9 years old, 6.05% of 10-19 years old, 8.53% of 20-29 years old, 19.29%-21.67% of 30- > or =60 years old.</p><p><b>CONCLUSIONS</b>The inoculation againt HAY and HBY is enhanced in the youngster population. HBsAg carrier and UCY infection is decreasing. The HEY infection in the Hid people is lower than the Han nationality.</p>