Existence of hepatitis B virus surface protein mutations and other variants: demand for hepatitis B infection control in Cambodia by Ko Ko, Kazuaki Takahashi, Shintaro Nagashima, Chikako Yamamoto, Vichit Ork, Aya Sugiyama, Tomoyuki Akita, Masayuki Ohisa, Channarena Chuon, Md. Shafiqul Hossain, Bunsoth Mao, Junko Tanaka

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Prevalence of total hepatitis A antibody among 5 to 7 years old children and their mothers in Cambodia by Shintaro Nagashima, Ko Ko, Chikako Yamamoto, E. Bunthen, Serge Ouoba, Channarena Chuon, Masayuki Ohisa, Aya Sugiyama, Tomoyuki Akita, Md. Shafiqul Hossain, Vichit Ork, Bunsoth Mao, Junko Tanaka

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A longitudinal study of anti-SARS-CoV-2 antibody seroprevalence in a random sample of the general population in Hiroshima in 2020 by Aya Sugiyama, Fumie Okada, Kanon Abe, Hirohito Imada, Serge Ouoba, Bunthen E, Md Razeen Ashraf Hussain, Masayuki Ohisa, Ko Ko, Shintaro Nagashima, Tomoyuki Akita, Shinichi Yamazaki, Michiya Yokozaki, Eisaku Kishita, Junko Tanaka

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Intermediate hepatitis B virus infection prevalence among 1622 pregnant women in rural Burkina Faso and implications for mother-to-child transmission by Serge Ouoba, Ko Ko, Moussa Lingani, Shintaro Nagashima, Alice N. Guingané, E. Bunthen, Md Razeen Ashraf Hussain, Aya Sugiyama, Tomoyuki Akita, Masayuki Ohisa, Moussa Abdel Sanou, Ousmane Traore, Job Wilfried Nassa, Maimouna Sanou, Kazuaki Takahashi, Halidou Tinto, Junko Tanaka

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