British scientists have followed how the main symptoms of coronavirus infection have changed over time. The article was published on the medRxiv preprint server.
The authors of the scientific work analyzed the results of mass PCR testing in the UK, as well as the medical history of patients. In total, more than 5 million test results were processed.
So, in the period from April to December 2020, patients mainly complained of sore throat, cough, fever, loss of taste and smell. At this time, the circulating strain in the country was the “Alpha” strain, and the vaccination campaign had not yet started.
In the winter of 2021, signs of other respiratory viral infections and intestinal symptoms were also included in the typical manifestations of the coronavirus.
After May 2021, a headache was added to the complaints of COVID-19 patients. This symptom, like sore throat and runny nose, has been observed in partially vaccinated individuals. At that time, every second sick person faced muscle pain, weakness, and fatigue, and every third – with a loss of smell and taste. The Delta strain then dominated in the United Kingdom.
Scientists note that the likelihood of an asymptomatic course of coronavirus decreases after vaccination. After the first dose of vaccination, their set and strength of manifestations are reduced, according to the TV channel “Zvezda”.
Earlier that day, the chief physician of hospital No. 40 in Kommunarka, Denis Protsenko, said that the mortality rate in non-vaccinated patients who fell ill with COVID-19 was four times higher than those who were vaccinated, RT reports.
Large-scale vaccination is ongoing in Russia. The vaccination is given free of charge to everyone. Earlier, five drugs for coronavirus were registered in the country: Sputnik V, which became the first vaccine against COVID-19 in the Russian Federation and the world, Sputnik Light, EpiVacCorona, Covid Vaccine, and EpiVacCorona-N.