Source: China – South China Morning PostThere are signs that immune protection from the world’s most widely used coronavirus vaccine drops significantly after six to eight months but a booster shot lifts levels three to five times, a new study has found.The study came as some countries, including Thailand, Indonesia and Turkey, consider offering a third booster shot to people in high-risk and older age groups. The study was published on Medrxiv.org without peer review on Sunday.Since May last year researchers, including Yu Hongjie…Read More