There are 277 Covid-19 vaccines in development globally, of which 93 have entered human testing , according to WHO.Most of the vaccines in clinical testing are injected but there are two oral formulations and seven nasal-spray formulations.
There are 277 Covid-19 vaccines in development globally, of which 93 have entered human testing , according to WHO.Most of the vaccines in clinical testing are injected but there are two oral formulations and seven nasal-spray formulations.