MANILA/SAO PAULO/DALIAN, China -- Crowds thronged to a pharmacy in the Brazilian city of Sao Paulo on Sunday, eager to receive Pfizer's coronavirus vaccine. Many quickly left as soon as it ran out, turning down the Chinese-developed Sinovac shots the store had in abundance.
A lack of confidence in Chinese vaccines worries officials in Beijing, which has offered shots to many Southeast Asian and South American nations as part of its diplomatic charm offensive.
