Members of a Nigerian committee tasked with verifying the safety of oral polio vaccine amid suspicion that it causes HIV/AIDS and infertility have deemed the product safe, the Nigerian daily Vanguard reports. Committee members were dispatched early last month to South Africa and India to monitor analyses of the vaccine and to Indonesia to meet with scientists at a vaccine production company. The team found trace amounts of estradiol, a hormone suspected of causing infertility, but said the amounts were minute, "much less than what is found in recycled drinking water in several developed countries."