Highlights
- Researchers from Britain underscored the need for booster shot
- The study is based on data from December 8, 2020 – July 31, 2021
- Some countries are already planning for a booster dose of COVID vaccine
London: Protection against COVID-19 offered by two doses of the Pfizer/BioNTech and the Oxford/AstraZeneca vaccines begins to fade within six months, underscoring the need for booster shots, according to researchers in Britain. After five to six months, the effectiveness of the Pfizer jab at preventing COVID-19 infection in the month after the second dose fell from 88 per cent to 74 per cent, an analysis of data collected in Britain’s ZOE COVID study showed. For the AstraZeneca vaccine, effectiveness fell from 77 per cent to 67 per cent after four to five months.
Also Read: Pfizer, AstraZeneca COVID Vaccines Less Effective Against Delta Variant: Oxford-Led Study
The updated analysis was based on data from more than a million app users during the period December 8, 2020 to July 31, 2021, comparing self-reported infections in vaccinated participants with cases in an unvaccinated control group.
More data is needed in younger people because participants who had their shots up to six months ago tended to be elderly as that age group was prioritised when the shots were first approved, said the study authors, who discussed the results in an online webinar.
ZOE Ltd was founded three years ago to offer customised nutritional advice based on test kits. The company’s ZOE COVID Symptom Study app is a not-for-profit initiative in collaboration with King’s College London and funded by the Department of Health and Social Care.
Under a worst-case future scenario, protection could fall below 50 per cent for older people and healthcare workers by the winter, Tim Spector, ZOE Ltd co-founder and principal investigator for the study, said.
Also Read: US Food And Drug Administration Gives Full Approval To Pfizer-BioNTech COVID-19 Vaccine
It’s bringing into focus this need for some action. We can’t just sit by and see the protectiveness slowly waning whilst cases are still high and the chance of infection still high as well, Tim Spector told BBC television.
Britain and other European nations are planning for a COVID-19 vaccine booster campaign later this year after top vaccine advisers said it might be necessary to give third shots to the elderly and most vulnerable from September.
The U.S. government is preparing to provide third booster doses starting in mid-September to Americans who had their initial course more than eight months ago.
Also Read: India Does Not Have Sufficient Data To Decide On COVID-19 Booster Dose: Experts
This is a reminder that we cannot rely on vaccines alone to prevent the spread of COVID,” said Simon Clarke, Associate Professor in Cellular Microbiology at the University of Reading, who was not involved in the study.
He cautioned that the results may have been distorted by the surge in overall cases in Britain in July.
A separate British public health study found last week that protection from either the Pfizer-BioNTech or the AstraZeneca vaccine against the now prevalent Delta variant of the coronavirus weakens within three months.
The Oxford University study found at the time that 90 days after a second shot of the Pfizer or AstraZeneca vaccine, their efficacy in preventing infections had slipped to 75 per cent and 61 per cent respectively. That was down from 85 per cent and 68 per cent, respectively, seen two weeks after a second dose.
Also Read: Mixing And Matching Of Vaccines Will Help Overcome Shortage: Dr Gagandeep Kang
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
NDTV – Dettol Banega Swasth India campaign is an extension of the five-year-old Banega Swachh India initiative helmed by Campaign Ambassador Amitabh Bachchan. It aims to spread awareness about critical health issues facing the country. In wake of the current COVID-19 pandemic, the need for WASH (Water, Sanitation and Hygiene) is reaffirmed as handwashing is one of the ways to prevent Coronavirus infection and other diseases. The campaign highlights the importance of nutrition and healthcare for women and children to prevent maternal and child mortality, fight malnutrition, stunting, wasting, anaemia and disease prevention through vaccines. Importance of programmes like Public Distribution System (PDS), Mid-day Meal Scheme, POSHAN Abhiyan and the role of Aganwadis and ASHA workers are also covered. Only a Swachh or clean India where toilets are used and open defecation free (ODF) status achieved as part of the Swachh Bharat Abhiyan launched by Prime Minister Narendra Modi in 2014, can eradicate diseases like diahorrea and become a Swasth or healthy India. The campaign will continue to cover issues like air pollution, waste management, plastic ban, manual scavenging and sanitation workers and menstrual hygiene.
World
21,38,99,205Cases
17,76,47,182Active
3,17,88,440Recovered
44,63,583Deaths
Coronavirus has spread to 195 countries. The total confirmed cases worldwide are 21,38,99,205 and 44,63,583 have died; 17,76,47,182 are active cases and 3,17,88,440 have recovered as on August 26, 2021 at 3:55 am.
India
3,25,58,530 46,164Cases
3,33,725 11,398Active
3,17,88,440 34,159Recovered
4,36,365 607Deaths
In India, there are 3,25,58,530 confirmed cases including 4,36,365 deaths. The number of active cases is 3,33,725 and 3,17,88,440 have recovered as on August 26, 2021 at 2:30 am.
State Details
State | Cases | Active | Recovered | Deaths |
---|---|---|---|---|
Maharashtra |
64,37,680 5,031 |
53,695 435 |
62,47,414 4,380 |
1,36,571 216 |
Kerala |
38,83,429 31,445 |
1,70,829 10,959 |
36,92,628 20,271 |
19,972 215 |
Karnataka |
29,42,250 1,224 |
19,344 466 |
28,85,700 1,668 |
37,206 22 |
Tamil Nadu |
26,05,647 1,573 |
18,352 251 |
25,52,507 1,797 |
34,788 27 |
Andhra Pradesh |
20,06,191 1,601 |
14,061 384 |
19,78,364 1,201 |
13,766 16 |
Uttar Pradesh |
17,09,173 21 |
345 7 |
16,86,034 28 |
22,794 |
West Bengal |
15,44,817 708 |
9,185 32 |
15,17,239 730 |
18,393 10 |
Delhi |
14,37,550 65 |
389 22 |
14,12,081 86 |
25,080 1 |
Chhattisgarh |
10,04,282 52 |
627 26 |
9,90,100 78 |
13,555 |
Odisha |
10,03,210 887 |
7,558 97 |
9,88,090 721 |
7,562 69 |
Rajasthan |
9,54,048 8 |
121 7 |
9,44,973 15 |
8,954 |
Gujarat |
8,25,347 17 |
159 1 |
8,15,108 17 |
10,080 1 |
Madhya Pradesh |
7,92,114 5 |
79 5 |
7,81,519 10 |
10,516 |
Haryana |
7,70,395 15 |
660 4 |
7,60,065 18 |
9,670 1 |
Bihar |
7,25,636 31 |
105 3 |
7,15,881 28 |
9,650 |
Telangana |
6,56,098 366 |
6,295 19 |
6,45,939 345 |
3,864 2 |
Punjab |
6,00,378 36 |
401 22 |
5,83,619 55 |
16,358 3 |
Assam |
5,86,378 689 |
8,006 1 |
5,72,765 681 |
5,607 7 |
Jharkhand |
3,47,763 8 |
140 13 |
3,42,491 21 |
5,132 |
Uttarakhand |
3,42,818 32 |
320 10 |
3,35,121 22 |
7,377 |
Jammu And Kashmir |
3,24,546 126 |
1,078 23 |
3,19,064 103 |
4,404 |
Himachal Pradesh |
2,12,458 198 |
2,058 4 |
2,06,821 193 |
3,579 1 |
Goa |
1,73,434 77 |
933 1 |
1,69,314 75 |
3,187 1 |
Puducherry |
1,23,078 71 |
760 5 |
1,20,509 76 |
1,809 |
Manipur |
1,11,975 377 |
3,572 38 |
1,06,640 411 |
1,763 4 |
Tripura |
82,498 114 |
1,164 51 |
80,541 61 |
793 2 |
Meghalaya |
74,586 354 |
2,815 5 |
70,479 352 |
1,292 7 |
Chandigarh |
65,071 2 |
36 1 |
64,223 1 |
812 |
Mizoram |
54,851 794 |
7,082 418 |
47,567 375 |
202 1 |
Arunachal Pradesh |
52,525 116 |
1,162 35 |
51,104 81 |
259 |
Nagaland |
29,718 49 |
871 17 |
28,235 65 |
612 1 |
Sikkim |
29,524 47 |
1,415 133 |
27,742 180 |
367 |
Ladakh |
20,515 15 |
64 9 |
20,244 6 |
207 |
Dadra And Nagar Haveli |
10,660 1 |
4 0 |
10,652 1 |
4 |
Lakshadweep |
10,327 9 |
33 5 |
10,243 4 |
51 |
Andaman And Nicobar Islands |
7,560 |
7 3 |
7,424 3 |
129 |
© Thomson Reuters 2021