The Chief of the World Health Organisation (WHO) is calling for a moratorium on administering booster shots of Covid-19 vaccines as a way to help ensure that doses are available in countries where few people have received their first shots.WHO officials say the science is unproven about whether giving booster shots to people who have already received two vaccine doses is effective in preventing the spread of the coronavirus.

 WHO Director-General Tedros Adhanom Ghebreyesus made the appeal mostly to wealthier countries that have far outpaced the developing world in numbers of vaccinations

WHO repeatedly called for rich countries to do more to help improve access to vaccines in the developing world. Tedros pointed to a WHO target set earlier this year to ensure that 10 percent of the populations in countries receive vaccines against the coronavirus. "WHO is calling for a moratorium on boosters until at least the end of September to enable at least 10 percent of the population of every country to be vaccinated," he said.

More than 90 percent of new COVID infections across the U.S. are from the delta variant, as per the latest data from the Center for Disease Control and Prevention. The primary delta strand accounted for 83.4 percent of infections in the two-week period that ended July 31, the CDC says. Other delta strands represented another 10 percent.

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