COVID-19 vaccine which has been developed by the University of Oxford and manufacturer AstraZeneca.The trial revealed that while the vaccine is 70 percent effective against coronavirus, it can increase to 90 percent when one half dose is given and followed by a full dose at least one month later.The UK has placed orders for 100 million doses of the vaccine, which is enough to vaccinate most of the population, if the jab receives regulatory approval.The government has also ordered 40m doses of a