In a study published in the medical journal The Lancet on July 20, 2020, Oxford University in England reported promising results from tests on an experimental Covid-19 vaccine. Among hundreds of people who got the shot in a human trial of the vaccine, almost all developed a dual immune response which lasted for at least two months. Larger trials evaluating the vaccine’s effectiveness, involving about 10,000 people in the UK as well as participants in South Africa and Brazil are still under way…