Influenza, the incidence is always higher than 2020, but is stabilizing


Rome, December 6 – The trend of the flu season 2021-22 seems to be stabilizing. After making its undisputed rocket debut, with twice as many flu cases as last year, the ISS Influnet’s integrated surveillance system, in its latest bulletin, records the progressive flattening of the curve, even if the curves remain even higher. last season.

In particular, in the last week there are estimated more than 280 thousand cases of influenza syndromes related to the entire Italian population, for a total of 1,325,000 searches since the beginning of surveillance. There was a slight decrease in new cases in children under 4 years (with an incidence equal to 21.05 cases per thousand assisted), which are confirmed as the most affected age group. In any case, the InfluNet report emphasizes that the impact level is equal to 4.76 cases per thousand assisted, therefore comparable to that of the previous week

In the age group 5-14 years. the incidence drops to 5.68 and in the 15-64 age group to 4.02. The lowest value is found among people aged 65 and over, where the incidence is equal to 2.29 cases per thousand assisted.

As already mentioned, despite the progressive flattening of the curve, the incidence remains almost double that recorded in the 2019-2020 season, when in the same week of the year it was equal to 2.38 cases per thousand. 822 Italian medical guards sent data on the frequency of syndromes among their patients, with the exception of those four regions (Val d’Aosta, Campania, Calabria and Sardinia) that have not yet activated surveillance.


In 11 of the regions that have activated surveillance, in 11 the incidence level of influenza syndromes is above the basic limit: Piedmont (6.5 reports per thousand patients), Lombardy (6.48), Emilia-Romagna (5 , 96), Umbria (5.36), Marche (5.25), Abruzzo (5.05), Sicily (4.99), Lazio (4.20), Puglia (4.14), Liguria (3, 88) and Tuscany (3,51). However, the ISS points out that the impact observed in some Regions is strongly influenced by the small number of doctors and pediatricians who have sent their data at the moment.
The report also states that most of the reported cases of influenza syndrome are attributed to other respiratory viruses than influenza, including mainly respiratory syncytial virus in children under one year of age: “Of the 589 samples analyzed by clinicians suspected various laboratories belonging to the InfluNet network, only 5 (0.8%) were found to be positive for influenza, all of type A (3 of the H3N2 subtype and 2 of the H1N1pdm09 subtype) “.

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