Pfizer, BioNTech begin Covid vaccine trial in children under 12

Shanghai mRNA COVID-19 vaccine begins phase 1 clinical trials

Meanwhile, India continues to witness a surge in new COVID-19 cases as 59,118 fresh infections and 257 deaths were reported in the country in the last 24 hours, the Union Health Ministry informed on Friday.

The director of the Centers for Disease Control and Prevention and former infectious disease chief at Mass.

Half of the students will be vaccinated at enrollment, while the other half will receive the vaccine four months late, according to the network, formed by NIAID to conduct studies of vaccines and antibodies for the new coronavirus.

All the students will keep an electronic diary, swab their noses daily and provide occasional blood samples.

But even as vaccinations increase, Walensky said it's still too soon for people to stop wearing masks or socializing indoors unless it's within the CDC guidelines for people who are fully vaccinated. The countrywide vaccination drive was rolled out on January 16 with healthcare workers (HCWs) getting inoculated and vaccination of the frontline workers (FLWs) started from February 2.

Vaccination is unequivocally that path to a return to normalcy - but USA health authorities have not yet given these tens of millions of people the go-ahead to return to their pre-pandemic lives. "So just ask people to do their best to be patient, to explore the opportunities that they have".

For seniors, especially, the ability to visit some of their children and grandchildren is a leap forward, but a far cry from normalcy.

People who have had prior infection and get one vaccine dose have much stronger neutralising ability, allowing them to maintain neutralising activity against the variants of concern, researchers say.

They did not test people who didn't develop symptoms, nor did they document how many close contacts of trial participants who became infected also caught coronavirus.

The vaccine is created to help your body recognise the virus if it encounters it in the wild, but as the virus mutates it begins to look subtly different, making it harder for the body to recognise.

Pfizer joins Moderna and AstraZeneca in testing their vaccines in children as young as 6 months, while Johnson & Johnson has plans to follow.