As the infection of the mutant virus "Delta strain" continues to spread around the world, there is a move to provide additional vaccinations to people who have completed vaccination in the United States, Europe, and countries in the Middle East, where vaccination is progressing. Are one after another.

[Israel]


Of these, in

Israel,

where more than 80% of people aged 16 and over have been vaccinated twice, the number of newly infected people per day has decreased to a single digit at one point, but a highly infectious mutant virus. With the spread of the "Delta strain", the number of infected people has increased again, so from August we have started the third vaccination for people over 50 years old.



[UK] In


the UK, the plan to start the third additional vaccination from September has been announced as "to maintain the effect of the vaccine" before winter in the Northern Hemisphere.



The targets are first,


▽ residents of facilities for the elderly

,

▽ elderly people


over 70 years old,


▽ medical workers, etc. who are considered to be at high risk of infection and

aggravation

, and


then


▽ 50 All people over the age of


▽ 16 to 49 years old, who are considered to be at high risk of aggravation, etc. are planned.

[USA]


On the other hand, on the 18th, the United States announced a policy to give the third vaccination from September to those who have been vaccinated with Pfizer and Moderna vaccine eight months after the second vaccination.



The reason is that


▽ the effect of preventing infection and onset decreases with time after vaccination,


▽ especially for Delta strains, it seems that such effect decreases,


▽ and the virus by the third inoculation. It is mentioned that research results have been obtained that the value of "neutralizing antibody" that suppresses the action of virus increases significantly.



The third vaccination is expected to start with people at high risk of infection and aggravation, such as healthcare workers and the elderly, and the FDA = Food and Drug Administration and CDC = Centers for Disease Control and Prevention, which will permit and recommend vaccinations in the future. A committee of experts will eventually decide if a booster should be given.

[Europe]


In addition, Germany, France, and Sweden have also decided to provide additional vaccinations to elderly people who have completed two vaccinations after autumn.



[South America / Middle East]


South America Additional vaccinations have also begun in Chile and Uruguay, Bahrain in the Middle East and the United Arab Emirates.



[WHO]


Regarding these movements, the WHO = World Health Organization said at the end of September that the vaccine supply would be affected if developed countries started the third vaccination while the supply of vaccines to developing countries was not progressing. Until now, they have called for no additional vaccinations, and concerns about global supply have also been discussed.

Significance of booster vaccination

Regarding the reasons for giving additional vaccinations to people eight months after the second vaccination with the new coronavirus vaccine, CDC Director Warensky said the vaccine may become less effective over time. I'm giving.



According to the CDC, New York state health officials surveyed approximately 10 million people who had completed vaccination and found that the vaccine was effective in preventing the transmission of the new coronavirus between early May and mid-July. It means that it decreased from 91.7% to 79.8%.



In addition, Warensky points out that the vaccine may be less effective against the highly infectious mutant virus "Delta strain".

On the other hand, Fauchi Dr. serve the chief medical advisor to the US government, the effect obtained by the additional vaccination of the vaccine,


▽ value of neutralizing antibodies to suppress the action of the virus is increased, that to prolong the effect,


this by ▽, delta He also emphasized the significance of booster vaccination by showing the view that the effect of preventing infection and onset will increase for strains.



On the other hand, the CDC is urging people who have not yet been vaccinated to be vaccinated, saying that the vaccine is still effective in preventing "severity" and "death."