CHINA ROLLS OUT SINGLE-DOSE JAB

China has given conditional approval for a single-dose Covid-19 vaccine, the world's first vaccine candidate to have entered clinical trials. Phase-I clinical trials of the vaccine started on March 16 last year. Hyped as a rival to Johnson and Johnson’s one-shot jab cleared by the US drug regulator, China's first Ad5nCoV Covid-19 vaccine was rolled out on Friday, the staterun Global Times reported. It is said to have a desirable protective effect af ter 14 days of inoculation. The protective effect can last at least six months af ter a single-dose inoculation and it can increase immune response by 10 to 20 times if the second dose is taken .