CDC Monthly Respiratory disease and Influenza Bulletin for Year 2023

Year 2023-July

In July 2023, National Influenza Surveillance sentinel sites collected 446 samples for Influenza and SARS-CoV-2 virus testing. There were 356 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 90 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Among 356 SARI specimens, 59 (16.6%) tested positive for influenza A/H1N1pdm, and 7 (2.0%) was positive for SARS-CoV-2 detected in SARI surveillance. Of 90 ILI specimens, 27 (30.0%) were tested positive for A/H1N1pdm, 1 (1.1%) was tested positive for B/Victoria and 1 (1.1%) was positive for SARS-CoV-2.


Year 2023-June

In June 2023, National Influenza Surveillance sentinel sites collected 633 samples for Influenza and SARS-CoV-2 virus testing. There were 533 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 100 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Among 533 SARI specimens, 116 (21.8%) tested positive for influenza, of which 115 were positive for A/H1N1pdm, and 1 was positive for A/H3N2. In addition, 72 (13.5%) samples were positive for SARS-CoV-2 detected in SARI surveillance. Of 100 ILI specimens, 42 (42.0%) were tested positive for influenza A/H1N1pdm, and 14 (14.0%) was positive for SARS-CoV-2.


Year 2023-May

In May 2023, National Influenza Surveillance sentinel sites collected 313 samples for Influenza and SARS-CoV-2 virus testing. There were 253 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 60 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Among 253 SARI specimens, 65 (25.7%) tested positive for influenza, of which 63 were positive for A/H1N1pdm, and 2 were positive for A/H3N2. In addition, 47 (18.6%) samples were positive for SARS-CoV-2 detected in SARI. Of 60 ILI specimens, 12 (20.0%) were tested positive for influenza A/H1N1pdm, and 17 (28.3%) was positive for SARS-CoV-2.


Year 2023-April

In April 2023, National Influenza Surveillance sentinel sites collected 233 samples for Influenza and SARS-CoV-2 virus testing. There were 180 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 53 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Among 180 SARI specimens, 11 (6.1%) tested positive for influenza A/H1N1pdm, and 2 (1.1%) were positive for SARS-CoV-2. Of 53 ILI specimens, 6 (11.3%) were tested positive for influenza A/H1N1pdm, 1 (1.9%) was negative for SARS-CoV-2.


Year 2023-March

In March 2023, National Influenza Surveillance sentinel sites collected 369 samples for Influenza and SARS-CoV-2 virus testing. There were 286 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 83 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Of 9 (3.1%) SARI samples tested positive for influenza viruses, 8 were positive for A/H1N1pdm, and 1 positive for A/H3N2. There was no sample tested positive for SARS-CoV-2 in SARI samples. Of 5 (6.0%) ILI specimens tested positive for influenza, 4 were positive for B/Vic and 1 positive for A/H1N1pdm. In addition, all ILI samples were negative for SARS-CoV-2.


Year 2023-February

In February 2023, National Influenza Surveillance sentinel sites collected 339 samples for Influenza and SARS-CoV-2 virus testing. There were 276 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 63 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Of 5 (1.8%) SARI samples tested positive for influenza viruses, 1 was positive for B/Vic, 3 positives for A/H1N1pdm and 1 positive for A/H5N1. There were 9 (3.3%) positive for SARS-CoV-2 in SARI samples. Of 3 (4.7%) ILI specimens tested positive for influenza, 2 were positive for A/H1N1pdm and 1 positive for B/Vic. In addition, there was no SARS-CoV-2 detected in ILI specimens.


Year 2023-January

In January 2023, National Influenza Surveillance sentinel sites collected 352 samples for Influenza and SARS-CoV-2 virus testing. There were 293 samples from Severe Acute Respiratory Illness (SARI) at 9 sites in 5 provinces (Figure 1). There were 59 samples from Influenza-Like Illness Surveillance at 17 sites in 16 provinces (Figure 1). Of 2 (0.7%) SARI samples tested positive for influenza viruses, all were positive for B/Vic. There were 17 (5.8%) positive for SARS-CoV-2 in SARI samples. Of 9 (14.0%) ILI specimens tested positive for influenza, 8 were positive for B/Vic and 1 positive for A/H3N2. In addition, 1 (1.7%) sample detected with positive SARS-CoV-2 in ILI specimens.