Real-world data shows Pfizer’s Covid vaccine is giving ‘very strong’ results after one dose

1.8ml of Sodium chloride is added to a phial of the Pfizer/BioNTech COVID-19 vaccine concentrate ready for administration at Guy’s Hospital at the start of the largest ever immunization progran in the U.K.’s history on December 8, 2020 in London, United Kingdom.

Victoria Jones – Pool | Getty Images

LONDON — New data from England has revealed how effective coronavirus vaccines are at fighting the disease, even after just one dose.

In December, the vaccine developed by Pfizer and BioNTech became the first shot to be approved and rolled out in the U.K.

Elderly people, health workers and care home staff were the first in line to be immunized. That was soon followed by the shot developed by British firm AstraZeneca and the University of Oxford, another vaccine that requires two doses.

Fighting infection

Curbing hospitalizations and deaths

The research, which had data from over 7.5 million people, also gave evidence that a single dose provides additional protection against hospitalization and death.

It said that coronavirus cases among vaccinated individuals had around half the risk of severe outcomes, compared with unvaccinated cases. It combined this with the estimates on their effectiveness against symptomatic disease, and predicted that a single dose of either vaccine is around 80% effective at preventing hospitalization in the elderly at around three to four weeks after the first dose.

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