Covid-19 has infected over 11 million people worldwide and claimed more than 5,00,000 lives with Europe and the United States overtaking China where the pandemic started last December. The World Health Organization (WHO) declared coronavirus a pandemic due to widespread scale of the outbreak and has warned that the worst of Covid-19 is yet to come. The United Nations said the coronavirus pandemic is the worst global crisis since World War II. In terms of the number of confirmed coronavirus cases, the US, Brazil, India, Russia and Peru are the five most-affected countries.