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Influenza epidemic activity continues to decline in Portugal


National Institute of Influenza Epidemiology Surveillance Health Bulletin. Ricardo Jorge (INSA) noted “a decrease in the detection of cases of influenza virus infection in the last three weeks” and an “excess mortality from all causes”.

At week 19 (May 9 to 15), the Portuguese Influenza Diagnostic Laboratory Network (Hospital) detected 323 positive cases of influenza virus, all types of A. In 184 of the cases, subtype A (H3) was identified. ).

“To date, 202 cases of co-infection with influenza virus and SARS-CoV-2 have been detected,” the report says.

As for the severity of the cases, the document points out that a case of influenza (Influenza A) was reported by 18 Intensive Care Units that sent information.

“The patient was 75 years old, had no chronic illness and her vaccination status against seasonal flu is unknown,” the newsletter reads.

Two flu cases were also reported by the three wards that sent information, and the Influenza A (H3N2) virus was identified.

“One patient was between 03-05 years old and another between 11-15 years old. Both had a chronic illness and indications for seasonal flu vaccination, but were not vaccinated”, highlight the INSA.

In the weeks of May 9-15, the incidence rate of influenza (GS) and the incidence rate of acute respiratory infections were estimated at 26.8 per 100,000 people, compared with 34.6 in the previous week.

The Institute emphasizes that this value must be interpreted in terms of “the reorganization of care for respiratory patients and the smaller population under observation than those observed in the same period in previous years, and that the history of the incidence rate weekly recalculated, on the date of publication of the bulletin “.

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According to the bulletin, 188 positive cases were detected for other respiratory agents.

Since the beginning of the flu season, 29 cases of influenza have been reported by the ICUs collaborating in the surveillance, all due to Influenza A virus, 1 due to A (H1N1), 2 due to A (H3N2), 1 of influenza virus. A (H3) subtype and 25 (86.2%) not subtype.

It was found that 13 (44.8%) patients were over 65 years old, 14 (48.3%) were between 15-64 years old and 2 (6.9%) were less than 15 years old, and 21 (72.4%) had chronic underlying disease, with a recommendation for seasonal flu vaccination.

Since the beginning of the season, 21 cases of influenza have been reported. In all cases, influenza A viruses were identified, 17 (81%) by A (H3N2) and 4 (19%) by subtype.

“All cases were 15 years or younger,” INSA says, adding that in 11 cases (52.4%) patients had a chronic underlying disease, of which 1 was vaccinated.

In the 2021/2022 season, the Portuguese Network for Influenza Diagnosis Laboratory reported 113,372 cases of respiratory infections and 7,562 cases of influenza were identified.

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