<p>A single dose of the Pfizer-BioNTech coronavirus vaccine reduces the risk of asymptomatic infections, helping to stem transmission, research suggests.<br>The UK has approved three coronavirus jabs – Pfizer-BioNTech, AstraZeneca-University of Oxford and Moderna – after studies demonstrated they significantly ward off severe disease.<br>With not everyone able to be immunised, or producing a strong immune response as a result of their vaccination, questions lingered as to whether the jabs prevented the infection itself.<br>Asymptomatic infections are particularly important amid the pandemic, given these individuals do not know to isolate and may unwittingly transmit the coronavirus even when they speak.<br>To learn more, medics from the Cambridge University Hospitals NHS Foundation Trust (CUH) swabbed the site's vaccinated and unvaccinated healthcare workers over two weeks.<br>Results suggest the risk of an asymptomatic infection decreases by four times more than 12 days after a worker received the Pfizer-BioNTech jab.</p>
