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Comparative studies on epidemiology of hepatitis b viral infection in three villages in hida gifu prefecture japan i. comparison between shokawa and miyagawa villages



Comparative studies on epidemiology of hepatitis b viral infection in three villages in hida gifu prefecture japan i. comparison between shokawa and miyagawa villages



Acta Scholae Medicinalis Universitatis in Gifu 33(3): 446-457



The frequencies of HBsAg, anti-HBs, HBeAg and anti-HBe were investigated to elucidate the mode of the HB viral infection in Shokawa and Miyagawa villages, where their population structure and environment were similar. HBsAg positive rates in Shokawa and Miyagawa villages were 2.1% and 1.5%, respectively. Among HBsAg positive females in Shokawa village at the generative age (20-49 years old), HBeAg positivity was greater than anti-HBe positive rate and many HBsAg positive children were detected. These results suggest the possibility of the vertical transmission of HB virus. In Miyagawa village, however, HBsAg positive females at the generative age were found to be less than those in Shokawa village. This finding is consistent with evidence that a vertical transmission of HB virus is very few in Miyagawa village. Anti-HBs positive rates in Shokawa and Miyagawa villages were 25.7% and 26.1%, respectively. Anti-HBs positive rates were found in 4.2% of population below 20 years-old and 34.7% of those above 20 years-old in Shokawa village. In Miyagawa village, meanwhile, the rates were found in 2.3% and 35.2%, respectively. Regardless of the subtype of HBsAg, there was a significant difference of anti-HBs positive rate between people below and above 20 years-old in both villages (P < 0.001). At the present time, these findings indicate that chance of HB viral infection is very low in the young generation below 20 years-old in both villages. In conclusion, HB viral infection is less during these recent 20 years in both villages. Especially in Miyagawa village, not only horizontal but also vertical infection of HB virus are found to be less, and will be less as far as the present environment is kept clean.

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