<prompt> Why is Covid-19 a major global concern despite the propey of influenza to spread faster than Covid-19 ?Median incubation period is more in influenzaReproductive number for covid-19 is 2-2.5Serial interval is 5-6 days in influenzaReproductive number for Influenza is more  <response>: Influenza Covid-19 Median incubation period 2 days 5.5 days Serial interval 3 days 5-6 days Moality 0.1 3 Though Influenza spreads faster than covid 19 but moality and reproductive number is higher for covid-19 due to which it is a disease of global concern . Reproductive number- No. of secondary infections generated from one infected person, which 2-2.5 in case of Covid-19 