WASHINGTON, United States (AFP) — Drug maker Johnson & Johnson asked the US Food and Drug Administration (FDA) on Tuesday to authorize booster shots of its Covid-19 vaccine for people over the age of 18. “Our clinical program has found that a booster of our Covid-19 vaccine increases levels of protection for those who have received our single-shot vaccine to 94 percent,” said Mathai Mammen, global head of research and development at J&J. J&J said […]