Many southern provinces issued flu warnings. Why did the flu suddenly increase in summer?Experts Reveal the Secrets-Southern, Influenza, Epidemic-Fast Technology (Media of Drive House)–Technology changes the future

In recent days, southern provinces including Guangdong, Jiangxi, Fujian, etc. have successively issued influenza warnings. For example, the Guangdong CDC announced as early as June 17 that influenza surveillance data indicated that the province has entered the peak of influenza epidemic in summer.

The latest surveillance data released by the China Influenza Center shows that in the 23rd week of 2022 (June 6, 2022 – June 12, 2022), the positive rate of influenza virus detection in southern provinces continued to rise, and some provinces entered the summer high incidence period. Influenza (H3N2) subtype virus dominated, and influenza activity in northern provinces was at a very low level.

Since the new crown epidemic in 2020, with the strengthening of prevention and control measures and the enhancement of residents’ awareness of protection, the incidence of influenza has declined in many parts of the country. In the past, the flu was more common in winter and spring, and now we are entering summer. Why is the flu suddenly becoming active in the southern region?

“Influenza still needs attention under the new crown epidemic”. Influenza surveillance data released by both the World Health Organization and the Chinese Center for Disease Control and Prevention show that this year’s influenza activity has increased compared to the previous year. According to the latest influenza surveillance report, the positive rate of influenza in southern provinces of my country continued to rise, with A(H3N2) subtype influenza virus being the main one. At the 2022 Academic Exchange Meeting on Seasonal Influenza Prevention and Control Strategies, Director Wang Dayan of the National Influenza Center of the Chinese Center for Disease Control and Prevention reminded.

According to the latest weekly influenza report of the National Influenza Center on June 17 (6.6-6.12), the proportion of influenza-like cases (ILI%) among outpatient cases reported by sentinel hospitals in southern provinces was 5.8%, higher than the previous week’s level (5.1%). , higher than the levels in the same period of 2019-2021 (4.4%, 3.0% and 4.3%), and significantly higher than the proportion of influenza-like cases (ILI%) in outpatient cases during the same period of the influenza pandemic season in 2019.

In addition, according to the latest data from the World Health Organization’s Global Influenza Surveillance and Response System, the incidence of influenza in the northern and southern hemispheres has rebounded significantly since 2022.

Since June, Fujian, Guangdong, Shenzhen, Hainan, Jiangxi and other places have issued emergency warnings one after another, and the number of fever clinic admissions in some medical institutions has increased, and many places in the south have entered the peak of influenza in summer.

On June 17, Kang Min, director of the Infectious Disease Prevention and Control Institute of the Guangdong Provincial Center for Disease Control and Prevention, said that according to the influenza surveillance data (22nd week, from May 30 to June 5), Guangdong Province has entered the peak of influenza epidemic in summer. The recent high level of influenza activity. In recent years, different influenza virus subtypes have been circulating alternately in Guangdong Province, with peaks in winter and spring and summer.

Influenza etiological monitoring results in Guangdong Province show that the predominant influenza strain in the province is “Type A 3”, that is, A(H3N2) subtype influenza virus. A(H3N2) subtype influenza virus is a common influenza subtype, which has been prevalent in Guangdong Province in the past years, such as the summer of 2015 and 2017.

“Due to climate change and other reasons, the number of fever clinic patients, especially children, has increased significantly. Affected by the epidemic of major infectious diseases such as influenza and the new crown pneumonia epidemic, the contradiction between supply and demand of fever clinics in some local medical institutions has become prominent. Problems such as long waiting time for medical treatment.” According to the website of the Fujian Provincial Health and Health Commission on June 20, Fujian Province is currently entering a high-influenza season, and the Fujian Provincial Health and Health Commission held a special meeting on June 19 to study the deployment of influenza prevention and control and medical treatment of fever patients. service work.

According to the disease control of Longhua District, Shenzhen, the pathogen monitoring of influenza virus in the whole province shows that H3N2 is becoming the current circulating strain. The whole population is generally susceptible to influenza, and high-risk groups such as pregnant women, infants, the elderly, and patients with chronic diseases are more severely affected by influenza.

Yang Weizhong, Executive Dean of the School of Cluster Medicine and Public Health of Peking Union Medical College and Vice President of the Chinese Preventive Medicine Association, called on the 2022 Seasonal Influenza Prevention and Control Strategy Academic Exchange Conference that high-risk groups and vulnerable groups should be vaccinated against the new crown in a timely manner, and influenza vaccines should be vaccinated early Vaccine to prevent flu and new crown superinfection.

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