China Acute Respiratory Infectious Diseases Report (week2, 2025)
Week 2 of 2025 (January 6, 2025 – January 12, 2025), and carried out the detection of 10 viruses, including COVID-19, influenza virus, respiratory syncytial virus, adenovirus, human metapneumovirus, parainfluenza virus, coronavirus, bocavirus, rhinovirus and enterovirus, as well as Mycoplasma pneumoniae, on samples collected from sentinel hospitals (excluding Hong Kong, Macao and Taiwan) nationwide.
The main pathogens of outpatient samples were mainly influenza virus, human metapneumovirus, and adenovirus. The main pathogens of inpatient samples were influenza virus, Mycoplasma pneumoniae, and human metapneumovirus, and the specific results are shown in Table 1, Figure 1 and Figure 2. There were regional differences between the north and the south and differences among different age groups in the test results, as shown in Tables 2 and 3.
Table 1 Positive rate of nucleic acid detection of respiratory tract samples in week 2 (%)
| Pathogens | Outpatients | Inpatients | ||
| Week 2 | Compared to last week* | Week 2 | Compared to last week* | |
| COVID-19 | 1.3 | -0.2 | 1.2 | -0.8 |
| FLU | 35.9 | 0 | 21.5 | +0.2 |
| RSV | 2.9 | +0.1 | 4.0 | +1.1 |
| ADV | 4.7 | +1.5 | 2.5 | -0.1 |
| HMPV | 5.7 | -0.4 | 5.0 | -0.3 |
| PFLU | 1.8 | 0 | 1.3 | -0.2 |
| Coronavirus | 2.2 | +0.5 | 1.3 | -0.2 |
| HBoV | 0.8 | +0.2 | 1.1 | +0.2 |
| HRV | 3.8 | -0.5 | 4.2 | -0.2 |
| EV | 1.2 | -0.4 | 1.1 | -0.2 |
| Mpn | 1.5 | -0.5 | 5.1 | -0.5 |
Table 2. Regional differences in the positive rate of nucleic acid detection of major pathogens in respiratory tract samples in week 2
| Province | Outpatients | Inpatients | ||||
| 1st | 2nd | 3rd | 1st | 2nd | 3rd | |
| South | FLU | HMPV | HRV | FLU | HRV/HMPV | RSV |
| North | FLU | ADV | HMPV | FLU | Mpn | HMPV |
The southern provinces include: Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Hubei, Hunan, Guangdong, Guangxi, Hainan, Chongqing, Sichuan, Guizhou and Yunnan.
The northern provinces include: Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia, Liaoning, Jilin, Heilongjiang, Shandong, Henan, Tibet, Shaanxi, Gansu, Qinghai, Ningxia, Xinjiang and the Xinjiang Production and Construction Corps.
Table 3. Differences in the positive rate of nucleic acid detection of major pathogens in respiratory tract samples in week 2 by age group
| Age | Outpatients | Inpatients |
| 0~4 | FLU | FLU |
| HMPV | RSV | |
| RSV | HMPV | |
| 5~14 | FLU | FLU |
| ADV | Mpn | |
| HMPV | HMPV | |
| 15~59 | FLU | FLU |
| HRV | HRV | |
| HMPV | Mpn | |
| ≥60 | FLU | FLU |
| HMPV | HRV | |
| HRV | HMPV |
Figure 1-A: Weekly trend of positive rate of nucleic acid detection of respiratory tract samples of influenza-like cases in sentinel hospitals
Figure 1-B Weekly trend of positive rate of influenza virus testing in respiratory tract samples of influenza-like cases in sentinel hospitals (since 14 weeks in 2021).
Fig. 2 Weekly trend of positive rate of nucleic acid detection of respiratory tract samples and pathogens in sentinel hospitals
The analysis of the results shows that the outbreak of acute respiratory infections is still at a high level this week. Among them, influenza viruses are the main pathogens causing acute respiratory infections, which are still in the seasonal epidemic period, and the level of influenza activity is expected to gradually decline in the middle to late this month, and the level of influenza activity varies between different provinces. The positivity rate of human metapneumovirus fluctuates, with children aged 14 years and younger being the main affected group. The positive rate of respiratory syncytial virus continued to fluctuate and increase in cases aged 0~4 years. The positive rates of Mycoplasma pneumoniae and rhinovirus continued to decrease, while the positive rates of adenovirus fluctuated at a low level. Other respiratory pathogens, such as the COVID-19, are at low prevalence levels.
Resource from CDC
