Since the beginning of the covid-19 pandemic, scientists have not wavered in their efforts to analyze the characteristics of the virus and its serious health consequences. every certain time new investigations are published on the good results of vaccines against the virus, without forgetting the consequences that the infection leaves among those who have suffered it.
New Swiss research, which will be presented at the European Congress of Clinical Microbiology and Infectious Diseases (ECCMID) next April, revealed that the Persistent Covid-19 is much less likely after infection with the omicron variant than after the first pandemic variant.
The Swiss study also found that healthcare workers infected with the original virus were up to 67% more likely to report long-term Covid-19 symptoms than those who did not have this virus variant. On the contrary, Healthcare workers whose first infection was with the omicron variant were less likely to experience long-term COVID-19 symptoms.
The investigation also found that having omicron after a first variant infection did not increase the risk of prolonged covid-19 or fatigue than having an infection from just the original virus.
Carol Strahm of the Division of Infectious Diseases and Hospital Epidemiology at St Gallen Cantonal Hospital in Switzerland assessed the rates of prolonged COVID symptoms in healthcare workers infected with the wild-type SARS-CoV-2 virus, the omicron variant (BA 1) or both, and compared them with uninfected controls.
This is the study on persistent covid
In the prospective study, participants 1,201 health professionals, 81% were women, with an average age of 43 years from nine Swiss health networks. The participants, recruited between June and September 2020, underwent regular tests for covid-19 and provided information about their vaccination status.
In March 2021 (Q1), September 2021 (Q2) and June 2022 (Q3), they completed online questionnaires asking which, if any, of 18 long-term COVID-19 symptoms they experienced . The most frequent symptoms were loss of smell and taste, tiredness and weakness, exhaustion and hair loss. The questionnaire also covered levels of fatigue. The median follow-up time for parental viral infections was 18 months.
In the first trimester, the risk of prolonged symptoms of covid-19 was 67% higher in the 157 healthcare workers who had the original infection than in controls not infected with this variant. In the third trimester, the risk of prolonged symptoms was 37% higher in those who had wild-type infection than in controls.
A similar pattern was observed in the case of fatigue. In the first trimester, the risk of fatigue was 45% higher in those who had the parental virus, but by the third trimester the difference between the two groups was no longer significant.
However, heThe 429 healthcare workers whose first positive COVID-19 test was for the omicron variant were no more likely to have prolonged COVID-19 symptoms than uninfected controls. Fatigue rates were also similar between groups.
The analysis also revealed that reinfection also carries no greater risk of persistent Covid-19 or fatigue than infection with the first variant alone. Likewise, it has been proven that vaccination does not affect the risk of suffering from prolonged covid.