Advertisement
Wednesday, Oct 05, 2022
Outlook.com
Outlook.com

Explained: Are Some Covid-19 Vaccines More Effective Than Others?

AstraZeneca's two-dose vaccine used in many countries has faced questions about the exact degree of its effectiveness indicated by studies. But experts agree those shots, too, protect against the worst outcomes.

Explained: Are Some Covid-19 Vaccines More Effective Than Others?
| File Photo
Explained: Are Some Covid-19 Vaccines More Effective Than Others?
outlookindia.com
2021-04-08T13:18:18+05:30

It's hard to tell since they weren't directly compared in studies. But experts say the vaccines are alike on what matters most: preventing hospitalisations and deaths.

“Luckily, all these vaccines look like they're protecting us from severe disease,” said Dr. Monica Gandhi of the University of California, San Francisco, citing study results for five vaccines used around the world and a sixth that's still in review.

And real-world evidence as millions of people receive the vaccines show they're all working very well.

Still, people might wonder if one is better than another since studies conducted before the vaccines were rolled out found varying levels of effectiveness. The problem is they don't offer apples-to-apples comparisons.

Consider the two-dose vaccines from Pfizer and Moderna, found to be about 95 per cent effective at preventing illness. Studies for those shots counted a Covid-19 case whether it was mild, moderate or severe — and were conducted before worrisome mutated versions of the virus began circulating.

Then Johnson & Johnson tested a single-dose vaccine and didn't count mild illnesses. J&J's shot was 66 per cent protective against moderate to severe illness in a large international study. In just the US, where there's less spread of variants, it was 72 per cent effective. More importantly, once the vaccine's effect kicked in it prevented hospitalisation and death.

AstraZeneca's two-dose vaccine used in many countries has faced questions about the exact degree of its effectiveness indicated by studies. But experts agree those shots, too, protect against the worst outcomes.

Around the world, hospitalizations are dropping in countries where vaccines have been rolling out including Israel, England and Scotland — regardless of which shots are given. And the US government's first look at real-world data among essential workers provided further evidence that the Pfizer and Moderna vaccines are highly protective -- 90 per cent -- against infections whether there were symptoms or not.

Advertisement

Outlook Newsletters

Advertisement
Advertisement
Advertisement

Read More from Outlook

Lament Of Separation: Songs Of Habba Khatun, Last Queen Of Kashmir, Still Echo In Valley

Lament Of Separation: Songs Of Habba Khatun, Last Queen Of Kashmir, Still Echo In Valley

In happy times and sad, Habba Khatun’s sensuous songs make both young and old emotional. With the never-ending conflict bringing tragedies to every doorstep, Habba’s lyrics of separation amplify their mourning.

How Indian Laws Govern People’s Right To Love And Live

How Indian Laws Govern People’s Right To Love And Live

In India, only those relationships between a man and a woman are considered to be legitimate when there is a marriage between the two.

Kohli Quits Test Captaincy, Leaves Leadership Vacuum

Kohli Quits Test Captaincy, Leaves Leadership Vacuum

Virat Kohli, 33, had recently stepped down as India's T20I captain and was subsequently removed as the ODI captain.

UP Elections 2022: How Congress Is Harnessing Power Of 'Persecuted' Women To Counter BJP

UP Elections 2022: How Congress Is Harnessing Power Of 'Persecuted' Women To Counter BJP

A Mahila Congress leader, who is the face of the ‘Ladki Hoon, Lad Sakti Hoon’ campaign, however, has accused the party of anti-women bias after she was denied a ticket.

Advertisement