A medical worker prepares a dose of Sinopharm vaccine at a vaccination facility in Beijing on Jan. 15, 2021.T wo vaccines made by China’s Sinopharm appear to be safe and effective against COVID-19, according to a study published in a medical journal. Scientists have been waiting for more details about the two vaccines, even though they already are being used in many countries and one recently won the backing of the World Health Organization. (AP Photo/Mark Schiefelbein)