The third dose of COVID-19 vaccine may be inevitable due to mutations
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The third dose of COVID-19 vaccine may be inevitable due to mutations spreading
The third dose of COVID-19 vaccine may be inevitable due to mutations. According to reports, Pfizer said on Thursday (July 8) that there is evidence that the effectiveness of its COVID-19 vaccine has declined after six months.
At the same time, in response to the spread of the “Delta” strain of the COVID-19 variant virus, Pfizer is stepping up the development of the third dose of vaccine enhancer, and is expected to apply to the US Food and Drug Administration (FDA) for the third dose of vaccine enhancer next month Emergency use authorization.
On July 5, the Israeli Ministry of Health announced that the effectiveness of the Pfizer vaccine in preventing symptomatic COVID-19 pneumonia has dropped from more than 90% to 64%.
In response, Mikael Dolsten, Pfizer’s chief scientific officer and president of global research and development, said that this was because people who were vaccinated by Pfizer in January and February were re-infected with the virus.
Half a year after vaccination, as antibodies weakened, the effectiveness of Pfizer vaccines in preventing infections and the onset of symptoms declined.
Mikael Dolsten emphasized that, as shown by the data released by the Israeli Ministry of Health, Pfizer vaccine is still very effective in preventing severe symptoms, and its effectiveness is about 95%.
In addition, he also said that according to Pfizer’s research data, the level of neutralizing antibodies produced by the third injection of enhancer is 5 to 10 times higher than the level of antibodies produced after two doses, which indicates that the third injection of enhancer can People provide effective protection.
He said that many European countries and some countries in other regions have contacted Pfizer to discuss the implementation of the third injection of enhancer. Some countries may approve the third dose of enhancer earlier than the United States.
Some scientists still question whether an enhanced dose is needed. Dr. Eric Topol, founder of the Scripps Research Institute, an independent scientific research institution in North America, said: “Further research is needed to determine (whether an enhanced dose is needed).”
The U.S. Food and Drug Administration (FDA) and the U.S. Centers for Disease Control and Prevention (CDC) stated in a joint statement that if the third dose of enhancer is scientifically proven to be necessary, we will approve it. In addition, the joint statement also mentioned that Americans who have completed the vaccination do not need to receive the third booster.
(source:internet, reference only)
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