Regional Update, Influenza. Epidemiological Week 28 (27 July 2022)

Regional Update, Influenza. Epidemiological Week 28 (27 July 2022)

North America: Overall, influenza activity decreased in the subregion while SARS-CoV-2 continued to rise. In Mexico, influenza activity with A(H3N2) virus predominance decreased, while SARS-CoV-2 positivity continued to increase. SARI activity remained at moderate-intensity levels, whereas ILI activity rose to high-intensity levels, driven by the SARS-CoV-2 circulation. In the United States, influenza activity was low, with influenza A(H3N2) viruses predominance. In addition, RSV activity remained stable compared to previous weeks, while SARS-CoV-2 activity increased with higher COVID-19-associated hospitalizations.

Caribbean: Influenza activity remained very low, with the predominance of the influenza A(H3N2) virus. Belize, the Dominican Republic and Saint Lucia, reported increased SARS-CoV-2 activity, with increased SARI cases, although below the epidemic thresholds, except in Haiti, with levels above average for this time of year. In the Dominican Republic, RSV activity remained elevated at levels seen in the pre-pandemic period with SARS-CoV-2 cocirculation.

Central America: Influenza activity continued to decrease in the subregion, with influenza A(H3N2) virus predominance. In El Salvador and Nicaragua, influenza activity decreased to moderate-intensity levels, with the A(H3N2) virus predominance. SARS-CoV-2 activity rose across the subregion, with increased levels in El Salvador and Guatemala and Panama. Influenza and SARS-CoV-2-associated ILI counts remained at moderate levels with increased levels of SARI cases in Guatemala.

Andean Countries: Influenza activity remained low with A(H3N2) predominance and circulation above epidemic levels in Bolivia. However, in Bolivia, Colombia, and Peru, SARS-CoV-2 activity continued to increase.

Brazil and Southern Cone: Overall, influenza activity remained at low levels with influenza A(H3N2) predominance and driven by its circulation in Chile and Uruguay. SARS-CoV-2 activity continued to increase throughout the subregion. Chile, Paraguay, and Uruguay reported SARI activity elevated above average levels for time of year, with RSV and SARS-CoV-2 predominance in Chile, while SARS-CoV-2 and influenza predominated in Paraguay and Uruguay.