Pakistan: Coronavirus vaccines approved, mass trials for CanSinoBio

Pakistan has just approved China's Sinopharm COVID-19 vaccine for emergency use, just days after authorities green lighted the Oxford-Astra Zeneca vaccine. But Pakistan is also hosting mass trials for another Chinese-made vaccine, CanSinoBio. The testing requires thousands of willing volunteers, but they're tough to find in a country where anti-vaccination sentiment runs deep.