Regional Update, Influenza. Epidemiological Week 1 (19 January 2022) ﻿ ﻿

Regional Update, Influenza. Epidemiological Week 1 (19 January 2022)

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Regional Update, Influenza. Epidemiological Week 1 (19 January 2022) . (2022). [Newsletters]. PAHO. https://iris.paho.org/handle/10665.2/55631

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InfluRep19Jan2022.pdf (4.14 MB)

English and Spanish; 36 pages

Date

2022

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Pan American Health Organization

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[WEEKLY SUMMARY] North America: Overall, influenza activity remained low but increasing, while SARS-CoV-2 activity increased. In Canada, influenza A and B virus co-circulated with influenza A(H3N2) and A(H1N1)pdm09; SARS-CoV-2 activity slightly increased. In Mexico, influenza A(H3N2) prevailed, with B co-circulating and SARS-CoV-2 activity increased at moderate levels. In the United States, influenza A(H3N2) predominated, with SARS-CoV-2 activity increasing, hospitalizations and deaths remained elevated. Respiratory syncytial virus activity remained high in Canada and Mexico. Caribbean: Influenza remained at low activity levels. SARS-CoV-2 activity increased in Jamaica with increased number of pneumonia cases and SARI hospitalizations. In Suriname, SARS-CoV-2 and SARI activity continued at low levels. Central America: Influenza activity continued to increase and SARS-CoV-2 activity decreased to low levels overall. In Guatemala and Honduras, influenza activity increased with the predominance of influenza A(H3N2), and low SARS-CoV-2 circulation; while SARS-CoV-2 activity increased in Costa Rica. RSV activity decreased in the subregion. Andean: Overall, influenza activity remained low and SARS-CoV-2 activity continued at low levels; however, Bolivia, Ecuador and Peru reported increased influenza activity associated with A(H3N2) detections. SARS-CoV-2 activity stands elevated in Bolivia and Ecuador; and in Bolivia, SARI activity was recorded at extraordinary levels. Brazil and Southern Cone: Influenza activity increased to pre-pandemic levels, and SARS-CoV-2 activity continues at low levels, except in Argentina. Influenza A(H3N2) detections continue to rise in Brazil, Chile, Paraguay, and Uruguay. Most activity and increasing A(H3N2) detections are recorded in Brazil and Chile.

[RESUMEN SEMANAL] América del Norte: en general, la actividad de la influenza se mantuvo en aumento a niveles bajos, mientras que la actividad de SARS-CoV-2 aumentó. En Canadá, el virus de la influenza A y B circularon concurrentemente con los virus influenza A(H3N2) y A(H1N1)pdm09; la actividad del SARS-CoV-2 aumentó ligeramente. En México, predominó el virus influenza A(H3N2), con la circulación concurrente de B, y la actividad del SARS-CoV-2 aumentó a niveles moderados. En los Estados Unidos, predominó la influenza A(H3N2), con aumento de la actividad del SARS-CoV-2, las hospitalizaciones y muertes se mantuvieron elevadas. La actividad del virus respiratorio sincitial se mantuvo alta en Canadá y México. Caribe: la influenza se mantuvo en niveles bajos de actividad. La actividad del SARS-CoV-2 en Jamaica aumento en paralelo a mayor número de casos por neumonía y hospitalizaciones por IRAG. En Surinam, la actividad del SARS-CoV-2 e IRAG permaneció a niveles bajos. América Central: la actividad de la influenza continuó en aumento y la actividad del SARS-CoV-2 disminuyó a niveles bajos en general. En Guatemala y Honduras, la actividad de la influenza aumentó con el predominio de la influenza A(H3N2) y baja circulación de SARS-CoV-2; mientras que la actividad del SARS-CoV-2 aumentó en Costa Rica. La actividad del VRS decreció en la subregion. Andina: en general, la actividad de la influenza se mantuvo baja y la actividad de SARS-CoV-2 continuó en aumento; sin embargo, Bolivia, Ecuador y Perú informaron un aumento de la actividad de la influenza asociada con las detecciones de A(H3N2). La actividad de SARS-CoV-2 se mantiene elevada en Bolivia y Ecuador; y en Bolivia, la actividad de IRAG se registró en niveles extraordinarios. Brasil y Cono Sur: la actividad de la influenza aumentó a niveles prepandémicos y la actividad del SARS-CoV-2 continúa en niveles bajos, excepto en Argentina. Las detecciones de influenza A(H3N2) continúan aumentando en Brasil, Chile, Paraguay y Uruguay. La mayor parte de la actividad y las detecciones crecientes de A(H3N2) se registran en Brasil y Chile.

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Regional Update, Influenza. Epidemiological Week 2 (25 January 2022)
(PAHO, 2022) Pan American Health Organization
[WEEKLY SUMMARY]. North America: Overall, influenza activity remained low but increasing while SARS-CoV-2 activity increased. In Canada, influenza A and B virus co-circulated with influenza A(H3N2) and A(H1N1)pdm09; SARS-CoV-2 activity slightly increased. In Mexico, influenza A(H3N2) prevailed, with B co-circulating and SARS-CoV-2 activity increased at moderate levels and associated with higher SARI activity. In the United States, influenza A(H3N2) predominated, with SARS-CoV-2 activity increasing, hospitalizations and deaths remained elevated. Respiratory syncytial virus activity remained high in Canada and decreasing in the United States and Mexico. Caribbean: Influenza remained at low activity levels. SARS-CoV-2 activity increased in Jamaica with increased number of pneumonia and SARI cases. In Suriname, SARS-CoV-2 and SARI activity continued at low levels. Central America: Influenza activity continued to increase but remained low, and SARS-CoV-2 activity decreased to low levels overall. In Guatemala and Honduras, influenza activity continued to increase to high levels with the co-circulation of influenza A(H3N2) and influenza B, and low SARS-CoV-2 circulation. SARS-CoV-2 activity increased in Costa Rica recently and RSV activity decreased in the subregion overall. Andean: Overall, influenza activity increased but remained low and SARS-CoV-2 activity continued at low levels; however, Bolivia, Ecuador and Colombia reported increased influenza activity associated with A(H3N2) detections. SARS-CoV-2 activity stands elevated in Bolivia and Ecuador; and in Bolivia, SARI activity was recorded at extraordinary levels associated to SARS-CoV-2 activity. Brazil and Southern Cone: Influenza activity increased to pre-pandemic levels, and SARS-CoV-2 activity continues at low levels, except in Argentina with SARS-CoV-2 at high levels. Influenza A(H3N2) detections continue to rise in Brazil, Chile, Paraguay, and Uruguay. Most activity and increasing A(H3N2) detections are recorded in Brazil and Chile. Global: influenza activity remains low but continued to increase especially in the temperate zones of the northern hemisphere. In several countries influenza activity reached the levels seen this time of year in pre-COVID-19 period. In the temperate zones of the northern hemisphere, influenza activity although still low appeared to increase in some countries with detections of mainly influenza A(H3N2) viruses and in China B/Victoria lineage viruses. In Europe, influenza activity continued to increase. Influenza A(H3N2) predominated. In East Asia, influenza activity continued an increasing trend in China, while influenza illness indicators and activity remained low in the rest of the subregion. Influenza B/Victoria lineage viruses predominated. In tropical Africa, overall influenza activity continued decreasing trend. In Southern Asia, influenza virus detections of predominately influenza A(H3N2) increased overall, although reducing in several countries. In South-East Asia, sporadic influenza detections were reported in the Philippines. In the temperate zones of the southern hemisphere, influenza activity remained low overall, although increased detections of influenza A(H3N2) were reported in some countries in temperate South America. SARS-CoV-2 percent positivity from sentinel surveillance globally increased to approximately 30%. Activity remained under 10% positivity in the Eastern Mediterranean, South-East Asian and Western Pacific Regions of WHO. In the other WHO Regions, an increasing trend in positivity was observed in recent weeks. Overall positivity from non-sentinel sites also increased and was at 25%.
Regional Update, Influenza. Epidemiological Weeks 51-52 (11 January 2022)
(PAHO, 2022) Pan American Health Organization
[WEEKLY SUMMARY]. North America: Overall, influenza activity remained low but increasing. In Canada, influenza A and B virus co-circulated with influenza A(H3N2) and A(H1N1)pdm09 among samples where subtyping was performed; SARS-CoV-2 activity slightly increased. In Mexico, influenza A(H3N2) prevailed, with B co-circulating and SARS-CoV-2 activity increased. In the United States, influenza A(H3N2) predominated, with SARS-CoV-2 activity increasing, hospitalizations and deaths remained elevated. Respiratory syncytial virus activity remained high in Canada. Caribbean: Influenza remained at low activity levels. Haiti reported a few detections in recent weeks with the predominance of influenza B/Victoria and A(H1N1)pdm09. In Suriname, SARS-CoV-2 and SARI activity decreased to low levels. Central America: Influenza activity continued low and SARS-CoV-2 activity decreased to low levels overall. In Guatemala, influenza activity decreased with the predominance of influenza A(H3N2) in the previous week, while influenza A(H3N2) circulation increased in Honduras with low SARI and ILI activity. Andean: Overall, influenza activity remained low; however, Bolivia, Ecuador, and Peru reported increased influenza activity associated with A(H3N2) detections. SARS-CoV-2 activity stands elevated in Bolivia and Ecuador; and in Bolivia, SARI activity continued at extraordinary levels. Brazil and Southern Cone: Influenza activity increased to pre-pandemic levels, and SARS-CoV-2 activity continues at low levels, except in Argentina. Influenza A(H3N2) detections continue to rise in Brazil, Chile, Paraguay, and Uruguay. Most activity and increasing A(H3N2) detections are recorded in Brazil and Uruguay. Global: In the temperate zones of the northern hemisphere, influenza activity, although still low, appeared to increase in some countries with detections of mainly influenza A(H3N2) and B Victoria lineage (mainly in China). In Europe, influenza activity continued to increase. Influenza A(H3N2) predominated. In East Asia, influenza activity continued rising in China, while influenza illness indicators and activity remained low in the rest of the subregion. Influenza B/Victoria viruses predominated. In tropical Africa, overall influenza activity continued decreasing, with both influenza A and B detected. In Southern Asia, influenza virus detections of predominately influenza A(H3N2) increased overall, although reducing in a few countries. In South-East Asia, sporadic influenza detections were reported in the Philippines. However, in the temperate zones of the southern hemisphere, influenza activity remained low overall. SARS-CoV-2 percent positivity from sentinel surveillance increased to approximately 30%. Activity remained under 10% positivity in the Eastern Mediterranean, South-East Asian and Western Pacific Regions of WHO. In the other WHO Regions, an increasing trend in positivity was observed in recent weeks. Overall positivity from non-sentinel sites also increased and was at 25%.
Regional Update, Influenza. Epidemiological Week 4 (8 February 2022)
(PAHO, 2022) Pan American Health Organization
[WEEKLY SUMMARY]. With the recent increase of influenza circulation in conjunction with SARS-CoV-2, countries are encouraged to enhance integrated surveillance to monitor transmissibility and severity of both viruses simultaneously and step up their influenza vaccination campaign to prevent severe disease and hospitalizations associated with influenza. Considering the COVID-19 context, clinicians should consider influenza in differential diagnosis especially for high-risk groups, and test and treat according to national guidance. North America: Overall, influenza activity remained at low levels while SARS-CoV-2 activity increased. In Canada, influenza A and B virus co-circulated and SARS-CoV-2 activity remained stable. In Mexico, influenza A(H3N2) prevailed, with B co-circulating and SARS-CoV-2 activity increased. In the United States, influenza A(H3N2) predominated, with SARS-CoV-2 activity elevated. Caribbean: Influenza activity continued low and positivity increased with influenza B predominating. SARS-CoV-2 activity increased in Belize and Saint Lucia. In Suriname, SARS-CoV-2 and SARI activity continued at low levels. Central America: Influenza activity continued to increase but remained low, and SARS-CoV-2 activity increased overall. In Guatemala and Honduras, influenza activity decreased with the co-circulation of influenza A(H3N2) and influenza B, and low SARS-CoV-2 circulation. SARS-CoV-2 activity continued to increase in Costa Rica. RSV activity decreased in the subregion overall. Andean: Overall, influenza activity decreased and SARS-CoV-2 activity continued at moderate levels; however Perú, reported increased influenza activity associated with A(H3N2) detections. SARS-CoV-2 activity stands elevated in Bolivia, Colombia and Ecuador. In Bolivia, SARI activity was recorded at high levels associated to SARS-CoV-2 activity. Brazil and Southern Cone: Influenza activity continued increased at pre-pandemic levels, and SARS-CoV-2 activity continued increasing, with SARS-CoV-2 at high levels. Influenza A(H3N2) detections prevailed in Brazil, Chile, Paraguay, and Uruguay. Global: Influenza activity remained low and decreased this period after a peak at the end of 2021. In the temperate zones of the northern hemisphere, influenza activity fell with detections of mainly influenza A(H3N2) viruses and B/Victoria lineage viruses reported. In Europe, influenza activity appeared to decrease. Influenza A(H3N2) predominated. In East Asia, influenza activity with primary influenza B/Victoria lineage continued increasing in China, while influenza illness indicators and activity remained low in the rest of the subregion. In Western Asia and Northern Africa, continuous influenza transmission has been reported in some countries. In tropical Africa, influenza activity was reported in some countries with influenza A(H3N2) predominating followed by influenza B/Victoria lineage viruses. In Southern Asia, influenza virus detections of predominantly influenza A(H3N2) remained elevated, although several countries reported decreased detections. In South-East Asia, sporadic influenza detections were reported by a few countries. In the temperate zones of the southern hemisphere, influenza activity remained low overall. SARS-CoV-2 percent positivity from sentinel surveillance continued to increase overall during this reporting period. Positivity increased to above 30% in the Eastern Mediterranean and European Regions and above 60% in the Americas region. Positivity also increased in the South-East Asian and Western Pacific Regions but remained under 20%. In the African Region, positivity decreased to under 20%. Overall positivity from non-sentinel sites also continued on an increasing trend.
Regional Update, Influenza. Epidemiological Week 52 (30 December 2022)
(PAHO, 2023) Pan American Health Organization
[WEEKLY SUMMARY]. North America: Influenza activity was moderate, although decreasing in the subregion, with the predominance of influenza A(H3N2) and co-circulation of A(H1N1)pdm09 and B/Victoria. The SARS-CoV-2 activity has increased, while RSV activity continued to decline. In Canada, influenza activity has decreased; most surveillance indicators were within expected levels. In Mexico, influenza activity continued above expected levels, with SARI cases at low-intensity levels. In the United States, influenza activity declined at low-intensity levels, with the percentage of deaths due to pneumonia, influenza, and COVID-19 above the average of previous seasons. RSV activity is high but continues to decrease. Caribbean: Influenza activity was moderate in the subregion with A(H3N2) virus predominance and A(H1N1)pdm09 co-circulation. The Dominican Republic reported increased influenza activity with influenza A(H3N2) circulation. SARS-CoV-2 activity remained low overall; however, Haiti and Dominica have shown increased COVID-19 activity, while Jamaica registered increased RSV activity. Central America: Influenza activity was at moderate levels, with the predominance of influenza A(H3N2) and the co-circulation of influenza B/Victoria (where lineage was determined). Increased influenza activity was reported in Honduras, with the circulation of influenza B (lineage undetermined). SARS-CoV-2 percent positivity decreased in the subregion overall, with an increased percent positive in Costa Rica, while in Guatemala, RSV activity was elevated. Andean: Influenza activity was low, but increasing, with the predominance of influenza A(H3N2) and co-circulation of influenza A(H1N1)pdm09 and B/Victoria. Bolivia and Ecuador reported increased influenza activity at extraordinary and moderate-intensity levels, with increased SARI activity at low-intensity levels in both countries. In addition, SARS-CoV-2 percent positivity continued raised in Bolivia, Colombia, Ecuador, and Peru, but with a declining trend. In the subregion, RSV activity was low overall. Brazil and Southern Cone: Influenza activity decreased to low levels, with influenza A(H3N2) predominance and co-circulation of influenza A(H1N1)pdm09 and influenza B/Victoria. Argentina reported decreasing influenza activity with influenza B (lineage undetermined). In Chile, influenza A(H3N2) predominated, showing a decreasing trend. In Paraguay, influenza activity was low, with A(H3N2) circulating. The SARS-CoV-2 activity was elevated across the subregion but with a decreasing trend. Increased RSV activity continued to be reported in Brazil and Chile. Global: Influenza activity remained elevated due to activity in the northern hemisphere. Where subtyped, influenza A viruses predominated, with a slightly larger proportion of A(H3N2) viruses detected among the subtyped influenza A viruses. In Europe, overall influenza activity continued to increase, with influenza positivity from sentinel sites remaining above the epidemic threshold at the regional level. Influenza A viruses predominated with A(H3N2) viruses accounting for most subtyped influenza viruses from sentinel sites but with regional differences. Half of reporting countries signaled high or very high intensity. In central Asia, influenza activity increased with influenza A(H1N1)pdm09 viruses predominant, followed by influenza B viruses. In Northern Africa, influenza detections increased among reporting countries with all seasonal subtypes detected. In Western Asia, influenza activity decreased overall with all seasonal influenza subtypes detected, though increased activity was reported in some countries in the transmission zone. In East Asia, influenza activity of predominantly influenza A(H3N2) viruses remained low overall among reporting countries but with increases reported in Mongolia and the Republic of Korea. In tropical Africa, influenza activity remained low, with detections of all seasonal influenza subtypes reported. However, activity increased in some countries in Eastern Africa. In Southern Asia, influenza activity remained low, mainly due to decreased activity reported in Iran (Islamic Republic of). Influenza A(H1N1)pdm09 was the most frequently detected subtype in the subregion. In South-East Asia, detections of predominantly influenza B remained elevated due to continued detections reported in Malaysia. COVID-19 positivity from sentinel surveillance continued to increase in the WHO Regions of the Americas (AMRO) and Western Pacific (WPRO). Activity increased to just over 30% in AMRO and 15% in WPRO and increased slightly in the European Region to 10%. Activity decreased and remained under 10% in the other regions. Globally, COVID-19 positivity from non-sentinel surveillance was around 10% or below, except in AMRO and WPRO, where activity maintained an increasing trend above 25%.
Regional Update, Influenza. Epidemiological Week 50 (28 December 2021)
(PAHO, 2021) Pan American Health Organization
[WEEKLY SUMMARY]. North America: Overall, influenza activity remained low but increasing. In Canada, influenza A and B virus co-circulated with influenza A(H3N2) and A(H1N1)pdm09 among samples where subtyping was performed; SARS-CoV-2 activity slightly increased. In Mexico, influenza A(H3N2) prevailed, with B co-circulating and SARS-CoV-2 activity decreased at moderate levels. In the United States, influenza A(H3N2) predominated, with SARS-CoV-2 activity increasing, hospitalizations and deaths remained elevated. Respiratory syncytial virus activity remained high in Canada and Mexico. Caribbean: Influenza remained at low activity levels. Haiti and French Guiana reported a few detections in recent weeks with the predominance of influenza B/Victoria and A(H3N2) in the latter. In Suriname, SARS-CoV-2 and SARI activity decreased to low levels. Central America: Influenza activity continued low and SARS-CoV-2 activity decreased to low levels overall. In Guatemala, influenza activity increased with the predominance of influenza A(H3N2), and SARS-CoV-2 activity increased. RSV activity remained elevated in Honduras. Andean: Overall, influenza activity remained low; however, Bolivia and Peru reported increased influenza activity associated with A(H3N2) detections. SARS-CoV-2 activity stands elevated in Bolivia and Ecuador, and in Bolivia, SARI activity was recorded at extraordinary levels. Brazil and Southern Cone: Influenza activity increased to pre-pandemic levels, and SARS-CoV-2 activity continues at low levels. Influenza A(H3N2) detections continue to rise in Brazil, Chile, Paraguay, and Uruguay. Most activity and increasing A(H3N2) detections are recorded in Brazil and Uruguay.