Geneva, Mar 26 (AP) The head of the World Health Organization is asking rich countries to donate at least 10 million coronavirus vaccines so the UN health agency can reach its goal of vaccination in all countries within the first 100 days of 2021. Tedros Adhanom Ghebreyesus says supply problems faced by the UN-backed effort COVAX, which aims to provide vaccines to all countries, means that about 20 countries are still awaiting their first doses of vaccines from the program..