COVID-19 vaccine projects have launched clinical trials on humans, says the London School of Hygiene & Tropical Medicine.Several have moved to phase two or to phase three, when they are injected into thousands of volunteers to evaluate their effectiveness, monitor side effects and collect other information that will allow them to be used safely.A vaccine created by the US biotech firm Moderna and one from Oxford University in collaboration with British-Swedish firm AstraZeneca are among those which are in the most advanced stages of development, along with several Chinese projects.These include one from the company CanSinoBIO, which has received permission to administer the vaccine to Chinese soldiers.This story has been published from a.