A five-year moratorium was imposed by the U.S. National Institutes of Health in 1996, because too many chimps had been bred for HIV research, and it has been extended annually since 2001.
Penundaan 5 tahun dikenakan oleh U.S National Institutes of Health (NIH) tahun 1996, karena terlalu banyak simpanse dibiakkan untuk penelitian HIV, and ia telah diperpanjang per tahun sejak 2001.