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Bharat Biotech’s Covaxin Effective Against Delta Plus Covid Variant: Study

According to a study conducted by the Indian Council of Medical Research-National Institute of Virology, Covaxin has shown less reduction in ‘neutralizing activity’ while comparing with Delta and Delta AY.1 (Delta plus) variants in those who are fully vaccinated with the vaccine

Bharat Biotech's Covaxin Effective Against Delta Plus Covid Variant: Study
Highlights
  • MoHFW designated the Delta Plus as a variant of concern on June 22
  • India has as many as 70 cases of Delta plus variant: MoHFW
  • Highly contagious Delta variant led to second wave in India: Expert

New Delhi: Bharat Biotech’s COVID-19 vaccine Covaxin has shown less reduction in ‘neutralizing activity’ while comparing with Delta and Delta AY.1 (Delta plus) variants in those who are fully vaccinated with the vaccine according to a study by the Indian Council of Medical Research-National Institute of Virology (NIV). This means that people vaccinated with Covaxin will be protected against the current variants Delta, Delta AY.1 and B.1.617.3.

Also Read: Explained: What Is A Breakthrough Infection And How To Prevent Catching COVID-19 After Getting Fully Vaccinated

The MoHFW on June 22 designated the ‘Delta Plus’ variant of the novel coronavirus, as a “variant of concern”. Currently, India has as many as 70 cases of Delta plus variant. According to the study,

A minor reduction was observed in the neutralizing antibody titer in COVID- 19 recovered cases full BBV152 vaccinated and post immunized infected cases compared to COVID-19 naive vaccinated individuals.

The study was conducted with samples collected from three groups. Group 1 samples were collected after two doses with a gap of 2.5 to 22 weeks,

Group 1, Sera of individuals vaccinated with two doses of COVAXIN [Female (n=24) and Male (n=18)] collected between 2.5 to 22 weeks after second dose.

After group 1, samples of those individuals were collected who had taken the second dose and recovered from Covid-19, “Group 2: COVID-19 recovered cases with two doses of COVAXIN [female (n=8); male (n=6)], collected 14-70 weeks after the second dose.” The last samples were collected from group 3, “Group 3: breakthrough cases post two-dose COVAXIN vaccinations [female (n=17); male (n=13)] collected between 2-18 weeks.”

Also Read: Entire Adult Population In India Will Be Vaccinated Against COVID-19 By December: Dr NK Arora, Head, Expert Panel On Immunisation

However, with the observed high titers, the sera of individuals belonging to all the aforementioned groups they would still neutralize the Delta, Delta AY.1 and B.1.617.3 variants effectively, said the study.

“The vaccine sera effectively neutralizes the Delta, Delta AY.1 and B.1.617.3 in spite of some reduction in titer, which means vaccination will protect against these variants,” Dr Pragya Yadav, head of the NIV’s Maximum Containment Facility told ANI “Sera of individuals who were fully immunized (with 2 doses) didn’t show significant reduction in the NAb titer against Delta, Delta AY.1 and B.1.617.3”, said Dr Samiran Panda, Head of epidemiology and infectious diseases.

NAb titer of sera of recovered cases with vaccinations and breakthrough cases were significantly high compared to those with two doses of vaccinations. According to Dr Samiran Panda, Immunization is key to protect from severity and deaths in the current situation and reduce the burden on healthcare system.

A significant increase in NAb titer was also observed among these two groups against Delta, Delta AY.1 and B.1.617.3 variants. This demonstrates the possible role of memory cells in immune boosting with post-infection or infection after immunization. The comparative analysis of all the groups revealed that the B.1.617.3 variant seems to be less susceptible to neutralization followed by Delta AY.1 and Delta variants compared to B.1, stated the study.

A recent study published by Hacisuleyman E, demonstrated a reduction in neutralization by 4 fold and 11 fold against Delta variant with the sera of healthy individuals vaccinated with two doses of ChAdOx1 and BNT162b2 vaccine respectively.

Also Read: India Administers Over 35 Crore Doses In 170 Days, Second Highest Globally, Says Union Health Ministry

(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

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