According to a new study, the fourth dose of Pfizer-BioNTech vaccine offers protection against COVID-19 but the effect of the jab wanes quickly. The study was published in the New England Journal of Medicine revealed the "rates of confirmed infection and severe COVID-19 were lower after a fourth dose of the vaccine than after only three doses.

Second booster shot protects against COVID-19 but effect remains short-lived: Study

According to a new study, people who take marijuana, alcohol or tobacco have an increased risk of being susceptible to breakthrough coronavirus cases even if they are fully vaccinated.

Smoking, marijuana may increase risk of breakthrough COVID-19 infection: Study

Two studies have shown that the massive inoculation drive has resulted in a sharp drop in COVID-19 hospitalisations across the United Kingdom. Watch: Preliminary results from a study in Scotland has found that the Pfizer-BioNTech vaccine reduced hospital admissions by up to 85 per cent four weeks after the first dose.

Vaccination has led to sharp drop in hospitalization in UK, studies show

According to a study, around 30 per cent of those hospitalized with coronavirus in England were readmitted for treatment within five months of their first release.

30% hospitalized in England with virus were readmitted within five months: Study

Continual illness after contracting Covid-19, sometimes referred to as "long Covid" may not affect just the respiratory system, but brain and kidneys too among others, doctors on Thursday said.

'Long Covid' may hit several body parts: Doctors