Kobayashi Midori, Hirakawa Keiko, Sawada Michihisa, Suzuki Chiemi, Saikawa Syuhei, Ando Hiroko, Nakane Miyuki, Nakano Takashi
Niger Polio Control Team, Japan Overseas Cooperation Volunteers, Japan International Cooperation Agency, Tokyo 151-8558, Japan.
Jpn J Infect Dis. 2003 Aug;56(4):175-7.