The final-stage testing of what is set to be the world's biggest Covid-19 vaccine trial got underway in the US on Monday as 30,000 citizens got ready to take part.Final-stage testing of the vaccine, developed by the National Institutes of Health (NIH) and Moderna Inc, began with volunteers at numerous sites around the US given either a real dose or a dummy without being told which.“I’m excited to be part of something like this.
This is huge,” said Melissa Harting, a 36-year-old nurse who received an injection in Binghamton, New York.Another company, Pfizer Inc, announced that it had started its own study of its vaccine candidate in the US and elsewhere.That study also aimed to recruit 30,000 people.It will be months before results trickle.