The incidence of influenza has increased, but the epidemic is declining

According to the Influenza Epidemiological Surveillance Bulletin, 18-24. April (week 16), the incidence of acute respiratory infection (ARI) followed an increase and also rose to 8.8 per 100,000 population (previous week: 5.2).

According to INSA, the 17 intensive care units (ICUs) that sent the data reported three cases of the flu this week (all due to influenza A). Two patients had a chronic illness and had not been vaccinated against seasonal influenza.

Since the beginning of the season, 25 cases of influenza have been reported in the surveillance departments, all due to the influenza A virus.

The two departments that sent the data reported one case of influenza (influenza A virus). Since the beginning of the season, 19 cases of influenza have been reported in the surveillance departments, all of which have been identified with the influenza A virus.

In the period 2021/2022, laboratories in the Portuguese network of influenza diagnosis laboratories (hospitals) reported 97,163 respiratory infections and 5,763 cases of influenza.

At week 16 (April 18-24), 446 positive cases of influenza virus, all type A, were identified.

To date, 119 cases of co-infection with influenza virus and SARS-CoV-2 have been reported.

In the release, INSA also states that since the beginning of the 2021/2022 season, other respiratory agents have been identified in 4,965 cases. In the week to which the bulletin refers, there were 74 cases.

By week 16 (April 18-24), a total of 204 influenza viruses with antigenic properties different from those contained in the 2021/2022 influenza vaccine were characterized.

Influenza vaccinations were started in Portugal at the end of September, earlier than usual due to the covid-19 pandemic, and more than 2.5 million people were vaccinated.

The INSA also mentions that mortality for all causes is “within this season’s expectations”.

As for the situation in Europe, it shows that in week 15 (11-17 April), the laboratory detection rate of influenza virus in several countries in central and western Europe was over 30%: in the Netherlands (74%), in France. (55%), Luxembourg (53%), Poland (47%), Norway (42%), Estonia (37%), Switzerland (36%), Italy (32%), Serbia (31%) and Spain (30%). %)%).

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