WASHINGTON DC : Despite risks involved, several people across the world are volunteering for the trial of COVID-19 vaccine, allowing the researchers to inject potentially deadly microbes inside their nose.Doctors first give the volunteers experimental vaccine, thereafter they are exposed to the deadly pathogen.
If the dose works and prevents healthy volunteers from getting ill, then the study can move forward, The Washington Post reported.Similar methods were used to work up malaria and cholera vaccines which are now being used to produce the coronavirus vaccine.