New study reveals surprising effects for those who took the Covid-19 vaccine
etimes.in | Dec 14, 2025, 10.57 PM IST
There is a wave of vaccine scepticism among people in general. The sentiment is furthered by few officials sitting at top positions capable of making laws and manufacturing narrative. It is in this context that the recent study on the effectiveness of Covid-19 vaccine should be read carefully.
A large population study published recently has produced results that may surprise both supporters and skeptics of the vaccine alike, not by uncovering hidden harms, but by measuring its impact on overall survival.
Covid-19 was first detected in Wuhan, China, in December 2019 and went on to reshape daily life across the globe. According to the BBC, more than 7.1 million deaths worldwide have been attributed to the virus, with around 227,000 deaths in the UK listing Covid-19 as the cause.
Mass vaccination campaigns followed at unprecedented speed. By December 2023, an estimated 67 percent of the world’s population had received at least one dose of a Covid-19 vaccine, according to the World Health Organization (WHO). While the rollout significantly reduced severe disease and hospitalisation, it also became a target for misinformation and public distrust, particularly around safety.
What the new study examined
The study, published in JAMA Network Open, analysed health outcomes among adults in France aged 18 to 59, comparing those who were vaccinated against Covid-19 with those who were not.
Researchers examined data from 22.7 million vaccinated individuals and 5.9 million unvaccinated individuals, representing roughly 40 percent of France’s total population. To be included in the vaccinated group, participants needed to have received at least one vaccine dose by 1 October 2021, with most having received two doses of either Pfizer-BioNTech or Moderna. Unvaccinated participants had not received any Covid-19 vaccine by 1 November 2021.
The results showed that vaccinated adults had a 25 percent lower risk of all-cause mortality compared with unvaccinated adults during the study period. This means vaccinated participants were less likely to die from any cause, not only Covid-19.
The difference was even more pronounced when researchers looked specifically at Covid-related outcomes. Vaccinated individuals had a 74 percent lower risk of dying in hospital from Covid-19 complications compared with those who were unvaccinated.
These findings suggest that vaccination provided protection extending beyond immediate infection prevention, particularly during periods when Covid-19 was still circulating widely.
Important limitations noted by researchers
The authors were careful to highlight limitations in their analysis. Vaccinated participants were more likely to belong to higher socioeconomic groups, which often correlates with better access to healthcare, healthier living conditions, and preventative medical care. These factors can independently reduce mortality risk, regardless of vaccination status.
Because of this, the researchers noted that not all of the observed benefit can be attributed solely to the vaccine itself.
Addressing concerns about rare side effects
Public concern has persisted around rare heart-related side effects such as myocarditis and pericarditis, conditions involving inflammation of the heart muscle or lining. These events are considered uncommon, affecting up to 1 in 10,000 vaccinated individuals, according to existing safety monitoring data.
Multiple studies have examined these risks and consistently found that the likelihood of developing myocarditis or pericarditis is higher after a Covid-19 infection itself than after vaccination. This has been reported across several peer-reviewed analyses and reinforced by public health agencies internationally.
Six years after Covid-19 first emerged, the virus continues to circulate, though it generally causes less severe illness due to widespread immunity and viral evolution. This large-scale French study adds to the growing body of evidence suggesting that Covid-19 vaccination not only reduced severe disease during the pandemic but was also associated with lower overall mortality among working-age adults.
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