Edith Arangoitia, 46 (along with her elderly mother), was vaccinated with Pfizer on February 16, 2021 at Dr. Galen Harnden in La Colaborativa in Chelsea, Massachusetts. -BioNTech Covid-19 vaccine.
Joseph Price | AFP | Getty Images
The White House’s chief medical adviser, Dr. Anthony Fauci, said on Monday that although a recent study conducted in the United States showed that the effect after a single injection is very good, Americans should continue to take two doses of Pfizer and Moderna Covid-1
A CDC study published last week found that a single dose of Pfizer or Moderna’s Covid-19 vaccine is 80% effective in preventing coronavirus infections among healthcare workers and other basic workers. Federal health officials said that two doses are better than one, adding that two weeks after the second dose, the effectiveness of the vaccine jumped to 90%.
Although the 80% figure is good news, Fauci said on Monday that he is still worried about the length of protection after a single dose, especially the emergence of highly infectious variants that have been shown to evade the protection of the vaccine.
Fauci said at the White House press conference on the pandemic: “When you look at the level of protection after a dose, it can be said to be 80%, but it’s a bit insignificant 80%.” “When you take one dose, The question is how long will it last?”
Fauci said the highly infectious Covid-19 variants that showed some resistance to the vaccine also posed a challenge. He said: “If you don’t have the full effect of the two doses, then you are in a vulnerable zone.”
When Fauci made his comments, some health experts and public health officials believed that the United States should give priority to giving Americans only one dose of the vaccine, and then continue with the second dose, in order to speed up the pace of national vaccination.
Unlike Johnson & Johnson’s vaccine, which requires one shot, Pfizer and Moderna’s vaccines require two injections three to four weeks apart. In the UK, health officials decided to extend the time between the first and second dose to 12 weeks to speed up the vaccination.
Fauci has stated many times in the past few months that the United States should stick to the two-dose system.
Dr. Paul Offit, a voting member of the FDA’s Vaccines and Related Biological Products Advisory Committee, reviewed Pfizer and Moderna’s vaccines for emergency use authorization. He told CNBC last week that the research showed that immunity was actually more “lasting” after the second vaccination. Dosage, which means that the protection may last longer.
Offit told CNBC that from the first dose to the second dose, the two-dose vaccine regimen produced ten times the number of neutralizing antibodies that had an important antiviral effect.
Second, and more importantly, scientists also detected so-called T cells after the second dose, which is another important part of the immune response and usually provides longer immunity.
Fauci said on Monday that he “respects” the argument for a single-dose strategy, but added that the United States currently has enough doses to provide Americans with the first and second doses. He said: “Although we have always maintained an open attitude, we believe that the route we have taken is the best route.”