A dose of the Sinovac vaccine is administered in Depok, Indonesia Bagus Indahono/EPA-EFE/ShutterstockA growing number of countries, which have relied on vaccines from China to control the coronavirus are now doubtful that they can do so alone. They face continued infections and the spread more transmissible delta variant.Cambodia was the latest country to approve booster shots for a vaccine on August 1. To boost immune protection, it will give the Oxford/AstraZeneca vaccination as a third dose.
