On April 7, a British study published in the medical journal The Lancet found that after vaccination, the average duration of COVID-19 symptoms caused by infection with Omicron was about 2 days shorter than that of delta infection. The study also notes that this is more pronounced in individuals who have received three doses of the vaccine: during the period of the main epidemic in Delta, the symptoms of infected people who received three doses of the vaccine lasted an average of 7.7 days, while the symptoms produced by the Omiljung infection lasted an average of 4.4 days, a difference of 3.3 days.
The study is titled "Symptom Incidence, Duration, and Risk of Hospital Admission in SARS-CoV-2 Infected People During the Dominance of the Omicron and Delta Variants: A Prospective Observational Study Based on ZOE COVID." After collecting data on test results and symptoms that participants self-reported in the ZOGEN APPLICATION, researchers from King's College London analysed data on nearly 5,000 infected people who were vaccinated between 20 December 2021 and 17 January 2022, when the prevalence of Omilon was over 70% in the UK and matched with data from 1 June to 27 November 2021 ( when Delta accounted for more than 70 % of infections in the UK ) and 1 Comparison of :1.
Source of the research article: The Lancet official website
On 26 November 2021, WHO defined the Aomikron variant, which first appeared in South Africa, as the fifth "concern variant". In the weeks that followed, Omikeron spread to more than 80 countries and became the main endemic strain in the UK, surpassing the previously dominant Delta on 20 December 2021.
London Underground, passengers wearing masks. Photo by Xinhua News Agency reporter Li Ying
The study found that the duration of symptoms after Infection in Aomi Kerong was shorter, with an average duration of 6.4 days, compared with Delta, compared with 8.7 days after infection with Delta, a difference of 2.3 days.
This was even more pronounced in individuals who had received three doses of the vaccine: during the Delta-dominated period, the symptoms of infected people who received the three doses lasted an average of 7.7 days, while during the period when The Semicon dominated, the symptoms lasted an average of 4.4 days, a difference of 3.3 days. In the population who received only two doses of the vaccine, Delta's symptoms lasted 9.6 days after infection, and Omilon's symptoms lasted 8.3 days, a difference of only 1.3 days. This also supports the role of the COVID-19 vaccine booster needle.
The study also found that 12 of the 32 symptoms assessed were significantly less prevalent in Omexjong-infected people than among Delta infected people, including loss of smell, sneezing, runny nose, chest tightness, eye soreness, hair loss, tinnitus, etc.
However, during the Omicron epidemic, the likelihood of sore throat and hoarseness is significantly higher than during the Delta epidemic. The study also found that people infected with Omikejong were less likely to develop at least one of the three typical symptoms of the coronavirus (fever, loss of smell, persistent cough) compared to patients infected with Delta.
The study also noted that Omilon was 25 percent less likely to develop a symptomatic infection leading to hospital admission than Delta.
"The shorter duration of symptoms indicates that the duration of infection may be shorter, but this is still to be confirmed by viral load studies." The researchers said in the article that the study may affect public health guidance.
At present, the epidemic caused by the Omikejong BA.2 strain is still ongoing in China, and the data from this study also brings some inspiration. Earlier, Lu Hongzhou, president of the Third People's Hospital of Shenzhen and member of the Disease Prevention and Control Expert Committee of the National Health and Health Commission, said in an interview with a cover news reporter that asymptomatic infected people are as contagious as symptomatic infected people, and in clinical manifestations, the symptoms of sore throat in Omi Kerong infected people are very obvious.
In the context of Omicron replacing Delta as the main epidemic strain, the National Health Commission recently issued the "Diagnosis and Treatment Plan for Novel Coronavirus Pneumonia (Trial Ninth Edition)", which divides confirmed cases into mild, ordinary, severe and critical, and implements centralized isolation management for mild cases and is no longer sent to designated hospitals for treatment. In addition, the home health monitoring period for the release of isolation control and discharged patients was shortened from 14 days to 7 days.
But at the same time, we must also see that "the harm caused by the epidemic of the Aomi Kerong strain to a country and region is still very serious." On April 1, at the press conference of the joint prevention and control mechanism of the State Council, Wu Zunyou, chief expert of epidemiology of the Chinese Center for Disease Control and Prevention, told the cover news reporter that although the Aomi Kerong BA.2 strain had a high proportion of asymptomatic infected people during the epidemic, due to its rapid transmission speed, a large number of infected people will be produced in a short period of time, and through the analysis of the data released by some foreign countries, it can be seen that the number of deaths caused during the epidemic of the Aomi Kerong strain is higher than the number of deaths caused during the same period during the epidemic of the Oderta strain.
"We must strive to control the epidemic in a short period of time. Dynamic zeroing must be adhered to. Wu Zunyou said.
Source: Cover News