コロナワクチン接種後の抗体レベル、毎月４０％のペースで低下 今年一月に接種した場合、感染に対する有効率はたった１６％

 

HMO: Early vaccinees are twice as likely to catch COVID as later recipients

Latest research ‘definitely’ reinforces argument for giving boosters to the elderly, says lab chief at Leumit

By Nathan Jeffay 25 July 2021, 4:51 pm

Health care workers on duty taking swabs for coronavirus tests in Jerusalem, July 22, 2021. (Yonatan Sindel/Flash90)

People vaccinated before late February are twice as likely to catch the coronavirus than other inoculated Israelis, according to new research.

“We looked at tens of thousands of people tested in the month of June, alongside data on how long had passed since their second shot, and found that those vaccinated early were more likely to test positive,” Dr. Yotam Shenhar, who headed the research, told The Times of Israel.

“This definitely reinforces the argument for giving a third vaccine dose to the elderly.”

The report, published by the healthcare provider Leumit, comes on the heels of other Israeli studies that suggest a decreasing vaccine effectiveness, partly as a result of the Delta variant and partly because of the passage of time. However, British data indicates the Israeli studies may be overstating the case.

Data released by the Health Ministry on Thursday suggested that people vaccinated in January were said to have just 16% protection against infection now, while in those vaccinated in April the effectiveness was at 75%

The Leumit study looked only at the apparent waning of protection over time, and divided the vaccinated population into two based on inoculation dates, comparing early vaccinators to late vaccinators.

An Israeli youth receives a COVID-19 vaccine in Tel Aviv on July 6, 2021. (Jamal Awad/Flash90)

Shenhar, head of Leumit’s labs, acknowledged that the early vaccinators group includes many people who raced to get shots because they have underlying illnesses, which may make them more vulnerable to infection. But he said that could not fully account for the stark effect seen in the data.

Shenhar said the data should prompt the government to seriously consider booster shots for over-70s.

“Now we see vaccination effectiveness drops, so it seems we definitely need to think about a third vaccine,” he said. “We have started already by giving the immunocompromised, but in my assessment we need to consider giving third shots to everyone over 70 or 80. We shouldn’t wait long; we need to make a decision fast.”

If he were formulating policy, Shenhar said, he would “definitely” start giving boosters to elderly Israelis.

In his study, the apparent waning effect in immunity was felt across all ages. For all age groups, early vaccinators were 1.95 times more likely to be confirmed coronavirus positive. Among those aged 60-plus, early vaccinators are twice as likely to get infected. For those aged 40-59 early vaccinators are 2.1 times more vulnerable, and among under 39s they are 1.6 more likely to catch the coronavirus.

“In a previous analysis we showed that as time passes since the vaccine, the level of antibodies drops at a rate of about 40% per month. This new study builds a clearer picture of the effect seen in the months after vaccination,” said Shenhar.

Israel has seen a dramatic rise in recent COVID-19 infections, with the daily caseload rising from several dozen to over 1,400 in recent days.

https://www.timesofisrael.com/hmo-those-who-inoculated-early-twice-as-likely-to-catch-covid-as-later-adopters/

ワクチンパスポート所持者には三か月ごとのブースター接種を条件とした更新を義務付けないと無意味。（爆ｗｗｗｗｗｗｗｗｗｗｗｗｗ 

そしてブースターを打ち続けるともう身体が肝心な時に抗体を作らなくなってしまうんじゃまいか？（爆ｗｗｗｗｗｗｗｗｗｗｗｗｗ

Fewer than 1% of all patients who fall severely ill with COVID-19 are later reinfected - suggesting immunity could last for MONTHS, study finds

• Patients who recover from severe COVID-19 cases are very unlikely to be infected again, a new study shows
• The analysis examined over 9,000 patients with severe cases and found that only 0.7% tested positive after recovery
• Of the 63 patients who were reinfected, only two died from COVID-19 during their second infection
• Non-white patients, those with asthma, and smokers were more likely to test positive again
• Researchers say COVID-19 reinfection is still possible, though, especially if patients encounter the Indian Delta variant 

By Betsy Ladyzhets For Dailymail.Com

Published: 16:35 EDT, 17 June 2021 | Updated: 16:35 EDT, 17 June 2021 

https://www.dailymail.co.uk/health/article-9698257/Fewer-1-patients-fall-severely-ill-COVID-19-later-reinfected.html

,、、、（爆ｗｗｗｗｗｗｗｗｗｗｗｗｗ