The study is based on the analysis of data provided by 63,002 British patients, infected and vaccinated, on the ZOE Covid application, which lists the symptoms.
The study of the data provided on a British application for recording Covid symptoms allows a team of researchers to affirm that the symptoms of the Omicron variant last on average three days less in people who have received a booster dose. Their results were published in early April in the scientific journal The Lancet.
They were based on the data of 63,002 patients vaccinated and contaminated with Omicron or Delta, having had at least one of the 32 symptoms present in the application. Their analysis shows that those who received a booster dose retained symptoms of Omicron for an average of 4.4 days, compared to 7.7 days for those who did not.
The Omicron/Delta Difference
However, it is impossible to determine exactly which patients were contaminated by Delta or Omicron. The researchers thus deduced this information according to the periods when a variant was largely in the majority. Those contaminated with Omicron retain their symptoms for an average of 8.3 days and those infected with Delta for 9.6 days.
Finally, if the loss of smell is among the most frequently reported symptoms during the “Delta period”, it is less present during the Omicron wave. On the other hand, sore throats have been identified more by people contaminated with Omicron.