The information presented in this update is based on data provided by Ministries of Health and National Influenza Centers of Member States to the Pan American Health Organization (PAHO) or from updates on the Member States’ Ministry of Health web pages.
Regional Update EW 07, 2015
- North America: Influenza activity remained elevated however all influenza indicators decreased or remained the same as the previous EW. In Canada, ILI activity decreased this week and is within expected levels. Influenza A detections continued to decrease (12.2% positivity) while those of influenza B (5.3% positivity) continue to increase. Among subtyped strains, influenza A(H3N2) predominated, of which 94.5% differ from the current Northern Hemisphere vaccine strain. Detections of RSV remained high but continued to decrease. Influenza hospitalizations and laboratory-confirmed influenza outbreaks continue to decrease. In the United States, ILI activity (3%) continued to decreased but remained above the national baseline of 2%. Influenza detections (12.1% positivity) continued to decrease. Influenza A (not subtyped) and influenza A(H3) predominated and 69.7% of influenza A(H3N2) strains characterized differ from the current Northern Hemisphere vaccine strain. Influenza-associated hospitalization rates among adults aged ≥65 years remain higher this season in comparison to previous influenza seasons and the percentage of deaths due to pneumonia and influenza (7.4%) remained above the epidemic threshold. RSV activity continued at a high level. In Mexico, ARI and pneumonia activity continued at high levels but within expected levels. Influenza detections continued to decrease, 13.3% influenza positivity reported during EW 7. Influenza A(H3N2) predominated among circulating influenza viruses.
- Caribbean: Respiratory virus activity remained low with the exception of Puerto Rico, where influenza activity remained high but decreasing, and Jamaica, where active circulation of A(H3N2) has been reported.
- Central America: Respiratory virus activity remained low and ARI/SARI activity was within expected levels. Few influenza A detections were reported and RSV continued to decrease circulating at low levels.
- Andean Sub-region: Respiratory virus activity remained low and ARI/SARI activity was within expected levels (Colombia, Peru). RSV circulation was reported in Colombia and Ecuador. Co-circulation of influenza A(H3N2), influenza A(H1N1)pdm09 and influenza B was reported in Colombia.
- Southern Cone: Influenza activity remains at inter-seasonal levels and ARI/SARI and other respiratory virus activity remain low and within expected levels.