April 5, 2026

Science Chronicle

A Science and Technology Blog

April 5, 2026

Science Chronicle

A Science and Technology Blog

Author: Prasad Ravindranath

Blood pressure BPCardio vascular diseasesCoronavirusCOVID-19DiabetesPublic HealthSARS-CoV-2Vaccines

COVID-19: Ethical challenges of vaccinating people with comorbidities

Unlike in other groups, national databases of people with comorbidities are not available. However, though not comprehensive, since 2010, State

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CoronavirusCOVID-19Public HealthSARS-CoV-2Vaccines

Can COVID-19 vaccines with EUA be used at the population level?

Meanwhile, the Indian government has spelt out four high-risk groups — healthcare workers, frontline workers, those over 50 years of

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

By putting the vaccine approval on hold for want of data, DCGI has underscored its priorities

The greatly reassuring decision to seek additional safety and immunogenicity data from the Pune-based Serum Institute of India and Hyderabad’s

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Clinical trialCoronavirusCOVID-19Public HealthSARS-CoV-2Vaccines

Transparency in COVID-19 vaccine trials vital to gain public trust

Unlike Pfizer, AstraZeneca, which is carrying out the phase-3 trials of the Oxford vaccine in four countries, is yet to

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CoronavirusCOVID-19Herd immunityICMRIndiaPublic HealthSARS-CoV-2Vaccines

COVID-19: Challenges in achieving herd immunity through vaccination

But the government’s idea of vaccinating a “critical mass of people” for the purpose of breaking the virus transmission chain

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ChinaCoronavirusMERSPublic HealthSARS-CoV-2World Health Organisation

Why working alongside China to uncover the virus’s origin is important

Knowing the natural reservoirs and intermediate hosts and the events that permitted the virus to jump across the species barrier

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Clinical trialCoronavirusFDAPublic HealthSARS-CoV-2Vaccines

Moderna’s mRNA vaccine has 94.1% efficacy in final analysis, has applied for EUA

According to the release, the Phase-3 trial has exceeded two months of median follow-up post vaccination as required by the U.S. FDA

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

Oxford vaccine shows 90% efficacy in Phase-3 trial

Two doses of the vaccine given in two different regimen showed different efficacies. In the case of the regimen (involving

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Clinical trialCoronavirusEthicsPublic HealthSARS-CoV-2Vaccines

Ethics of denying COVID-19 vaccine to placebo group participants once EUA is granted

Offering the vaccine right away to those in the placebo group will first require unblinding the study. Unblinding the study and offering the vaccine to the placebo group will make it almost impossible to gather further information on vaccine efficacy, thus making full licensure challenging.

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

Oxford vaccine found safe and immunogenic even in older adults

The results were published online in The Lancet on November 19. The results are based on the study of 560

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

Pfizer’s mRNA vaccine 95% efficacious, final analysis shows

On November 18, Pfizer announced that the final efficacy analysis of its candidate mRNA-based vaccine (BNT162b2) in phase-3 trial has

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

More mRNA COVID-19 vaccines show stability at higher temperatures

The interim results of Moderna’s mRNA vaccine show that the vaccine has 94.5% efficacy in preventing COVID-19. The interim analysis,

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Clinical trialCoronavirusPublic HealthSARS-CoV-2Vaccines

Pfizer’s COVID-19 vaccine shows promise, many unknowns remain

The results of the Phase-1 trial, announced in August, first through a press release and then through a preprint a

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