Suzhou release
April 11th
Issued by the National Influenza Center
No.799, 14th week, 2024
China Influenza Surveillance Weekly
↓ ↓ ↓
Summary of influenza epidemic situation in China
(As of April 7, 2024)
Monitoring data show that the positive rate of influenza virus detection in southern and northern provinces continued to decline this week. B(Victoria) strain is the main strain, followed by A(H1N1)pdm09 subtype and A(H3N2) subtype. Five outbreaks of influenza-like cases were reported nationwide.
From October 2, 2023 to April 7, 2024 (based on the experimental date), 68 strains (95.8%) of influenza A(H1N1)pdm09 virus were similar to A/Victoria/4897/2022; 758 strains (34.8%) of influenza virus subtype A(H3N2) are similar strains of A/Darwin/9/2021 (chicken embryo strain); 745 strains (34.2%) were similar to A/Darwin/6/2021 (cell strain); B(Victoria) strain 1785 (99.0%) is similar to B/Austria/1359417/2021.
Since October 2, 2023, drug resistance monitoring showed that all influenza strains of subtype A(H1N1)pdm09 were sensitive to neuraminidase inhibitors, except one strain of subtype A(H1N1)pdm09. All strains of influenza A(H3N2) and influenza B are sensitive to neuraminidase inhibitors. All influenza strains A(H1N1)pdm09, A(H3N2) subtype and B are sensitive to polymerase inhibitors.
Epidemic situation of novel coronavirus infection in China
(March 2024)
First, the report of severe infections and deaths in Covid-19.
From March 1 to March 31, 2024, 31 provinces (autonomous regions and municipalities directly under the Central Government) and Xinjiang Production and Construction Corps reported 588 new cases of severe illness and 26 deaths (including 1 case of respiratory failure caused by Covid-19 infection and 25 cases of death caused by Covid-19 infection). See figure 1.
Fig. 1 Report of new severe and fatal cases of infection in Covid-19.
Two, the national fever clinic (clinic) diagnosis and treatment.
From March 1 to March 31, 2024, the number of fever clinics (consultation rooms) in 31 provinces (autonomous regions and municipalities directly under the Central Government) and Xinjiang Production and Construction Corps fluctuated around 160,000, rising from 143,000 on March 1 to 188,000 on March 12 (the highest this month), and then fluctuating down to the lowest of 134,000 on March 30. See figure 2.
Fig. 2 The changing trend of the number of fever clinics (consulting rooms) in China.
Third, the sentinel hospital monitoring situation
From the 10th week (March 4-March 10) to the 13th week (March 25-March 31) in 2024, the proportion of influenza-like cases in outpatient (emergency) consultations in sentinel hospitals in China decreased slightly, and the proportion of influenza-like cases was 5.6%, 5.3%, 4.9% and 4.9% respectively. See figure 3-1.
Figure 3-1 Changing trend of influenza-like cases reported by sentinel hospitals in China
The Covid-19 positive rate of influenza-like cases increased from 18.2% in the 10th week (March 4th-March 10th) to 21.1% in the 11th week (March 11th-March 17th) in 2024, and then decreased to 15.9% in the 13th week (March 25th-March 31st). See figure 3-2.
Figure 3-2 Trends of COVID-19 and Influenza Virus Positive Rate of Influenza-like Cases in National Sentinel Hospitals
IV. Monitoring of virus variation in local cases
From March 1 to March 31, 2024, Covid-19 infected by local cases submitted by 31 provinces (autonomous regions and municipalities directly under the Central Government) and Xinjiang Production and Construction Corps were all Omicron variants, covering 89 evolutionary branches. The main epidemic strains were JN.1 series variants, and the top three were JN.1, JN.1.4 and JN.1.1 respectively. See figure 4.
Fig. 4 Variation trend of local cases infected in novel coronavirus in China.
The temperature rose in April.
Pathogenic microorganisms are active.
Citizens’ outing increased.
In places where people are relatively concentrated
It is easy to cause the spread of respiratory infectious diseases
here
Remind the general public, teachers and students at school
Take good health protection.
Original title: "The latest epidemic situation report of China CDC! 》
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