More and more countries shorten the time to inject the 3rd dose

More and more countries shorten the time to inject the 3rd dose - Photo 1.

Poster calling for people to get the third dose in the UK – Photo: REUTERS

On December 20, Reuters news agency said the above new development reflects early evidence that the Omicron variant is spreading faster than the Delta variant – which dominates many parts of the world, and has the ability to infect people. infect someone who has been vaccinated or has had COVID-19.

Although data are limited, numerous laboratory studies suggest that the initial two doses may not be sufficient to prevent infection, and that a third dose may be more protective.

Research in southern Africa and the UK shows that the Omicron variant is spreading very quickly, sparking many predictions that Omicron will soon replace Delta in many countries. Scientists are also trying to understand the virulence of Omicron.

In early 2021, many countries, including the US, allowed a third dose about 6 months after the initial 2 doses.

However, by this December, Korea, the UK and Thailand have reduced the waiting period for the third dose to 3 months, while Belgium has reduced it to 4 months.

Finland recommends reducing the waiting period for the third dose to 3 months for high-risk groups. The Finnish government says it does not believe shortening the duration of vaccinations for the entire population will help slow the increase in hospital admissions.

France, Singapore, Taiwan, Italy and Australia have also reduced waiting times for the third dose to five months. The US, South Africa and Germany remained the same for 6 months.

So far, Spain and Lithuania have only given the third dose to immunocompromised, elderly or vulnerable people, while India has no plans to give a third dose.

Some scientists think that getting a third dose too soon could compromise the long-term protection of the vaccine, according to Reuters.

More data is needed, experts say, but there is a risk that shortening the duration could affect the effectiveness of vaccines that require multiple doses.

“In general, for vaccines that require multiple doses, the immune system works better if it has time to adapt,” said Dr. William Schaffner, an infectious disease specialist at Vanderbilt University School of Medicine (USA) – said. .

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