Friday, 16 April, 2021

How long will coronavirus vaccines protect people?

Pfizer  BioNTech COVID-19 shot 91% effective in updated data protective against South African variant Pfizer vaccine effective for 12-15-year-olds
Ginger Lawrence | 04 April, 2021, 23:07

From the 927 confirmed symptomatic cases of Covid-19 in the trial, 850 cases were in the placebo group and 77 cases were in the vaccinated group. Six of those cases were confirmed to be of the B.1.351 lineage, which caused concerns when it was first discovered as vaccines were not designed with this mutation in mind. And it appeared to be fully effective against the worrying B.1.351 variant of the virus, which is the dominant strain circulating in South Africa and which researchers feared had evolved to evade the protection of vaccines, the companies said. The approach has been tested against other viruses and studies in animals and people show they stimulate a strong and broad immune response.

The team identified 35 individuals with prior coronavirus infections who had received a single vaccine dose and 228 individuals without prior infection who had received both vaccine doses.

Global deaths from Covid-19 have topped 2.8 million since the pandemic began a year ago, with vaccines seen as the only real chance of returning to some form of normality.

The study found cellular T cell responses developed in 63% of the older people given two doses of the Pfizer jab. The FDA has previously said that it will expedite the authorization process for updated COVID-19 vaccines that target variants, according to CNBC. More than 300 cases of the South African variant have been detected in more than 25 US states and jurisdictions, according to federal data.

"When we sent these samples to Porton Down they said "we can't give you results right now because we've got to dilute them because they're so high, they're off the scale". And the combination of having very high levels of antibodies and persistent levels of protection are the recipe for a very long level of protection against these variants, ' Hensley added.

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I am currently now unemployed, after I left my job, partly due to afflictions", the Capitol attacker reportedly posted. Green further made Facebook posts about the "end times" and the anti-Christ, according to The New York Times.

There have been doubts raised about the effectiveness of vaccines on variants.

Although the new study did not look at the Oxford University/AstraZeneca vaccine, Prof Moss said the evidence for the jab is that "it's very, very effective".

"I think we can be confident about gaining control of variants with the current plans, and also leaving lockdown", he said.

Although the B.1.1.7 variant that originated in Britain has quickly spread across Europe and is gaining a foothold in the United States, the B.1.351 variant and similar variants are more concerning because they have shown to reduce the efficacy of three different COVID-19 vaccines in clinical trials in South Africa.