No one can commit to a clear answer because less than 1 year has passed since the first vaccinated
The coronavirus could turn out to be the flu, which requires vaccination every year, as circulating strains mutate quickly and immunity to the vaccine can fade too quickly, CNN reported. These are the main concerns of scientists around the world, but data so far show that current drugs against COVID-19 will protect us from 6 months to 2 years.
According to a study of the Pfizer vaccine, half a year after receiving the second dose, 46,000 people were over 90% protected against mild to severe COVID-19. The defense is likely to last even longer than half a year, experts say.
“It simply came to our notice then
protection can
to continue
years,
but we won’t know until we get more data, “said Dr. Peter Hotez, a vaccine expert and dean at Baylor Medical College in the United States.
“Studies of the human immune response after coronavirus vaccination show that they produce high levels of antibodies, and after a few weeks the body produces immune cells known as B cells, which continue to produce new protective antibodies,” said Dr. Anthony. Fauci, director of the National Institute of Allergy and Infectious Diseases of the United States.
Although Moderna’s vaccine also showed high protection 6 months after the second dose in many people (90% protects against infection and 95% against severe COVID), the company is already developing a new version of its product.
“A year ago, I was vaccinated with Moderna. Now, on my anniversary, I am happy to say that I have just received a 3rd dose adapted to the new strains to boost my immunity, ”said Ian Hayden, a volunteer with Modern.
This shows that despite initial evidence that immunity from coronavirus vaccination provides long-term protection, manufacturers have begun to make and test versions of their products that protect against alarming variants of the infection.
In January, a team led by Dr. Alicia Widge of the National Institute of Allergy and Infectious Diseases wrote that according to their research
two doses of
the vaccine of
“Modern”
produce
many antibodies that decrease very little over time.
Experts emphasize that current data do not mean that immunity stops at 6 months. And they just have data from volunteers for that time period for now.
“We wouldn’t be surprised to learn after a year that these vaccines still produce a strong immune response,” the researchers said. They even allow a single placement to be sufficient. This would make the measles vaccine closer to the measles vaccine. Measles vaccination protects against lifelong infection in 96% of people.
Russia’s Sputnik V is likely to provide immunity to COVID-19 for up to two years, say researchers at the Gamaleya Research Center, which developed the drug.
“Regarding our vaccine and the platform on which it was created (the Ebola vaccine), there is experimental evidence that the use of such methods brings protection for at least 2 years, and maybe more,” Russian scientists are convinced. Their vaccine showed an efficiency of 91.4%.
There is no data on the duration of protection of the AstraZeneca preparation yet, but it is believed that it will also keep for at least 6 months. The analysis showed that the vaccine was more effective with a longer interval between the first and second dose and that the single dose was 76% effective from the 22nd to the 90th day. The efficacy was 82.4% when the doses were given at 12-week intervals, compared with 54.9% when the interval was less than six weeks.
AstraZeneca will soon begin trials for next-generation vaccines that will work against all current variants of the coronavirus. The new preparations are expected to become available for use at the end of 2021.
Scientists also reveal that
immunity
of the spent
COVID-19 can
to continue
at least 6 months,
if not more. A British study shows that 705 participants who were found to have antibodies, 99% retained them for three months and 88% after six months.
A study even shows that 6 months after the disease, the antibodies have even sharpened their skills in fighting the coronavirus. Residues of the virus left in the gut after symptoms have disappeared can help the immune system work to improve the immune response in a new fight against the infection.
Vaccine immunity is expected to last as long as natural immunity or even longer.
– .
