Like what you've read?

On Line Opinion is the only Australian site where you get all sides of the story. We don't
charge, but we need your support. Here�s how you can help.

  • Advertise

    We have a monthly audience of 70,000 and advertising packages from $200 a month.

  • Volunteer

    We always need commissioning editors and sub-editors.

  • Contribute

    Got something to say? Submit an essay.

 The National Forum   Donate   Your Account   On Line Opinion   Forum   Blogs   Polling   About   
On Line Opinion logo ON LINE OPINION - Australia's e-journal of social and political debate


On Line Opinion is a not-for-profit publication and relies on the generosity of its sponsors, editors and contributors. If you would like to help, contact us.


RSS 2.0

Study indicates that lockdowns were counterproductive for Covid-19 immunity

By Murray Hunter - posted Friday, 16 December 2022

A study indicates that people who built up high levels of immune cells from coronaviruses that precipitate the common cold give some immunity against Covid-19.

A study, Cross-reactive memory T cells associate with protection against SARS-CoV-2 infection in COVID-19 contacts published in Nature Communications, outlined in previous studies have shown that T cells created from other coronaviruses can recognize SARS-CoV-2, the virus that causes COVID-19. In the new study, researchers at Imperial College London found that the presence of these T cells at the time of COVID-19 exposure could reduce the chance of getting infected.

The findings could provide a blueprint for a second-generation, universal vaccine to prevent infection from COVID-19 variants, including Omicron and ones that crop up later.



According to Rhia Kundu, the lead author of the study, being exposed to SARS-CoV-2 viruses doesn't always result in inflection. People with higher levels of T cells from the common cold were less likely to become infected with Covid-19.

In the study, blood samples from 52 people who lived with someone with diagnosed Covid-19. Among the 26 people who didn't contract Covid-19, there were significantly higher levels of pre-existing T cells from common cold coronaviruses, as compared with the 26 people, who did become infected.

Consequently, T cell were found to be cross-reactive, being able to recognize the proteins of SARS-CoV-2.

Current vaccines target the spike proteins, which are more likely to mutate than internal proteins as the virus mutates. Thus cross-reactive T cells maybe a more appropriate strategy to develop immunity against SARS-CoV-2.


This study provides a major insight into the public policy of lockdowns. Lockdowns isolated citizens from diseases like the common cold, where many originate from corona viruses. Had the public been able to go about their daily activities and come into contact with these other viruses, community immunity against SARS-CoV-2 may have been much more robust.

More studies are needed.


  1. Pages:
  2. Page 1
  3. All

This article was first published on Murray Hunter.

Discuss in our Forums

See what other readers are saying about this article!

Click here to read & post comments.

5 posts so far.

Share this:
reddit this reddit thisbookmark with Del.icio.usdigg thisseed newsvineSeed NewsvineStumbleUpon StumbleUponsubmit to propellerkwoff it

About the Author

Murray Hunter is an associate professor at the University Malaysia Perlis. He blogs at Murray Hunter.

Other articles by this Author

All articles by Murray Hunter

Creative Commons LicenseThis work is licensed under a Creative Commons License.

Photo of Murray Hunter
Article Tools
Comment 5 comments
Print Printable version
Subscribe Subscribe
Email Email a friend

About Us Search Discuss Feedback Legals Privacy