Berlin, Sep 1 (AP) The head of the World Health Organisation says he opposes widespread use of boosters for healthy people for now, underscoring the need to get doses of the COVID-19 vaccine to poorer countries. WHO Director-General Tedros Adhanom Ghebreyesus spoke in Berlin on Wednesday. He says the U.N. health agency last week witnessed the first decline in new global cases in more than two months..