According to the flu epidemiological surveillance bulletin for the period between April 18 and 24 (week 16), the incidence rate of acute respiratory infection (ARI) also rose to 8.8 per 100,000 inhabitants (5.2 in the previous week).

According to INSA, three cases of flu were reported this week by the 17 Intensive Care Units (ICU) that sent information (all due to Influenza A). Two of the patients had chronic illness and were not vaccinated against seasonal flu.

In the 2021/2022 season, the laboratories of the Portuguese Network of Laboratories for the Diagnosis of Influenza (Hospitals) reported 97,163 cases of respiratory infection and 5,763 cases of flu were identified.

In week 16 (April 18 to 24), 446 positive cases for the flu virus were identified, all type A.

So far, 119 cases of co-infection with the influenza virus and SARS-CoV-2 have been detected.