US scientists are skeptical of a one-shot regimen for Pfizer Inc and Moderna Inc Covid-19 vaccines, saying there isn't enough evidence that a single dose provides long-term protection. It was reported by Reuters.
It is noted that the vaccine should be used according to the recommendations of the US Food and Drug Administration (FDA).
“It is essential that these vaccines be used as authorized by FDA in order to prevent Covid-19 and related hospitalizations and death,” Peter Marks, director of the FDA’s Center for Biologics Evaluation and Research said.
Meanwhile, only 153 people (0.0032%) out of more than 4.7 million who received a first shot of the Pfizer coronavirus vaccine had any kind of serious side effects.