Connect with us

Coronavirus Outbreak

Protection From Pfizer And AstraZeneca’s COVID-19 Vaccine Wanes Within Six Months: UK Study

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

Protection From Pfizer And AstraZeneca’s COVID-19 Vaccine Wanes Within Six Months: UK Study
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 (WaterSanitation 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 pollutionwaste managementplastic banmanual scavenging and sanitation workers and menstrual hygiene

World

24,06,78,961Cases
20,23,40,977Active
3,34,39,331Recovered
48,98,653Deaths
Coronavirus has spread to 195 countries. The total confirmed cases worldwide are 24,06,78,961 and 48,98,653 have died; 20,23,40,977 are active cases and 3,34,39,331 have recovered as on October 18, 2021 at 4:17 am.

India

3,40,81,315 13,596Cases
1,89,6946,152Active
3,34,39,331 19,582Recovered
4,52,290 166Deaths
In India, there are 3,40,81,315 confirmed cases including 4,52,290 deaths. The number of active cases is 1,89,694 and 3,34,39,331 have recovered as on October 18, 2021 at 2:30 am.

State Details

State Cases Active Recovered Deaths
Maharashtra

65,91,697 1,715

32,230 994

64,19,678 2,680

1,39,789 29

Kerala

48,54,321 7,555

88,186 3,292

47,39,270 10,773

26,865 74

Karnataka

29,83,459 326

9,479 58

29,36,039 380

37,941 4

Tamil Nadu

26,87,092 1,218

14,814 208

26,36,379 1,411

35,899 15

Andhra Pradesh

20,60,472 432

6,034 159

20,40,131 586

14,307 5

Uttar Pradesh

17,10,028 9

119 10

16,87,011 19

22,898

West Bengal

15,80,530 624

7,421 24

15,54,132 634

18,977 14

Delhi

14,39,390 32

320 6

14,13,981 38

25,089

Odisha

10,35,077 443

4,542 68

10,22,250 508

8,285 3

Chhattisgarh

10,05,654 16

183 2

9,91,901 14

13,570

Rajasthan

9,54,390 2

42 2

9,45,394 4

8,954

Gujarat

8,26,290 10

207 6

8,15,997 16

10,086

Madhya Pradesh

7,92,684 5

84 12

7,82,077 17

10,523

Haryana

7,71,076 15

123 9

7,60,904 6

10,049

Bihar

7,26,026 5

48 4

7,16,317 1

9,661

Telangana

6,68,955 122

3,924 55

6,61,093 176

3,938 1

Assam

6,06,468 205

3,436 46

5,97,082 245

5,950 6

Punjab

6,02,035 27

227 8

5,85,264 16

16,544 3

Jharkhand

3,48,430 7

122 1

3,43,173 8

5,135

Uttarakhand

3,43,756 9

178 1

3,36,181 8

7,397

Jammu And Kashmir

3,31,062 95

843 12

3,25,793 107

4,426

Himachal Pradesh

2,21,437 131

1,303 5

2,16,414 125

3,720 1

Goa

1,77,522 60

604 6

1,73,572 62

3,346 4

Puducherry

1,27,396 52

585 13

1,24,961 64

1,850 1

Manipur

1,22,737 104

1,422 0

1,19,418 102

1,897 2

Mizoram

1,12,848 249

11,633 1,143

1,00,829 1,389

386 3

Tripura

84,321 16

104 4

83,401 12

816

Meghalaya

82,953 55

845 32

80,673 86

1,435 1

Chandigarh

65,302 3

25 3

64,457 6

820

Arunachal Pradesh

54,987 7

140 30

54,567 37

280

Sikkim

31,749 4

174 8

31,184 12

391

Nagaland

31,611 40

248 12

30,689 28

674

Ladakh

20,878 2

36 10

20,634 12

208

Dadra And Nagar Haveli

10,676 1

4 1

10,668

4

Lakshadweep

10,365

0 0

10,314

51

Andaman And Nicobar Islands

7,641

9 0

7,503

129

Coronavirus Outbreak: Full CoverageTesting CentresFAQs

Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Highlights From The 12-Hour Telethon

Leaving No One Behind

Mental Health

Environment

Join Us