Today the whole world is in an endeavor to deal with a newly arrived pandemic, COVID-19 which has all the potential to be catastrophic to mankind at its worst. This is not new; the world faced many pandemics earlier. According to the WHO, the worldwide spread of a new disease is called a pandemic that is if an infection becomes widespread in several countries at the same time, it may turn into a pandemic. Pandemic may be a result of new infection resulting from the evolution or change of an existing pathogen/parasite resulting in a change of host range, vector, pathogenicity or strain; or the occurrence of a previously unrecognised infection or disease or due to a known or endemic disease that either shifts its geographical setting or expands its host range, or significantly increases its prevalence . |
