Durability of immunity by hepatitis B vaccine in Japanese health care workers depends on primary response titers and durations

Nori Yoshioka, Matsuo Deguchi, Hideharu Hagiya, Masanori Kagita, Hiroko Tsukamoto, Miyuki Takao, Hisao Yoshida, Norihisa Yamamoto, Yukihiro Akeda, Yoshiko Nabetani, Ikuhiro Maeda, Yoh Hidaka, Kazunori Tomono