3 ms·
Probably because we already had an influenza vaccine which was developed in the 1940s. We have never had an approved vaccine for a corona virus. Thankfully ther
by nyokodo 6y ago
Probably because we already had an influenza vaccine which was developed in the 1940s. We have never had an approved vaccine for a corona virus. Thankfully there has been a lot of work on SARS and new vaccine technology for Ebola and Zika etc that could be applied to SARS-CoV-2 so we didn’t have to start from nothing this time.