Updated Mar 08, 2021 | 11:13 IST Researchers report that a particular protein in the virus — the receptor-binding domain, or RBD — is particularly attracted to respiratory cells in the lungs among people with type A blood. COVID-19 risk: Researchers find people with type A blood are at higher risk of coronavirus infection  |  Photo Credit: iStock Images New Delhi: Ever since the COVID-19 pandemic began, various factors have been associated with a higher or lower risk of the deadly viral infection. For instance, obesity, smoking and co-morbidities have be...