According to the latest Epidemiological Surveillance Bulletin for Influenza and other Respiratory Viruses, from the National Institute of Health Doutor Ricardo Jorge (INSA) and which refers to the period between December 25th and 31st (week 52), 36 cases of influenza were reported by the 21 Intensive Care Units (ICU) that sent information.

Of these 36 cases, the influenza A(H1N1) virus was identified in one case, the influenza A virus was not subtyped in 34 cases and it was not possible to identify the type of virus in one of the cases. Of the patients, 32 had a chronic illness, 33 had a recommendation for vaccination against seasonal flu, but only nine were vaccinated (in six cases the information is unknown).

Since the beginning of the surveillance season (October 2), 85 cases of influenza have been reported by the ICUs that collaborate in surveillance. Of the total cases, 85.9% (73) have an underlying chronic disease and 91.8% (78) have a recommendation for vaccination against seasonal flu, but only 36.1% (22) were vaccinated.

In the last week of the year, 1,472 positive cases of the flu virus were identified, of which 1,372 were type A and 49 were type B. In 147 of the cases subtype A(H1) was identified and in 14 subtype A(H3).