Antibodies in people infected by older versions of the novel coronavirus could become weaker in defending against COVID-19 variants over time, a recent study by a Japanese university showed.The findings by a Yokohama City University research team suggest that people who were infected in the early days of the pandemic, particularly those who had mild or no symptoms, still need to be vaccinated to reduce the risk of being infected by variants from Britain, South Africa, Brazil and India.In the study, conducted on 250 people between the ages of 21 and 78, who tested positive for COVID-19 betwe…READ FULL ARTICLE