The Influenza Epidemic Surveillance Bulletin from INSA reports an escalating flu epidemic from December 1 to 7. During this period, 97 cases of severe acute respiratory infections (SARI) were recorded at Local Health Units providing data for SARI monitoring.
“An increase in incidence rate compared to previous weeks was observed, with the SARI incidence rate reaching 12.5 cases per 100,000 inhabitants,” maintains the highest incidence rate in the age group 65 years and over, according to INSA.
In the last week, the Portuguese Laboratory Network for the Diagnosis of Influenza and Other Respiratory Viruses detected 1,164 positive flu cases, consisting of 1,163 cases of type A and one of type B.
The data show four reported flu cases from the 18 Intensive Care Units (ICUs) that submitted information, six fewer cases than the previous week, with the type A flu virus untyped.
Among ICU patients, one was aged 65 or older, two between 55-64, and one between 35-44 years. Three had an underlying chronic illness and were recommended for seasonal flu vaccination, one of whom was vaccinated.
Additional respiratory agents were identified in 328 cases, with Rhinoviruses/Enteroviruses and respiratory syncytial virus (RSV) being most frequently detected.
INSA states that overall mortality is as expected in Portugal but notes excess mortality during the analysis week in mainland Portugal, the North region, and the 75-84 age group.
In recent weeks, the flu virus has been the most commonly identified infectious agent in epidemiological surveillance.
Across the European Union and European Economic Area (EU/EEA), the number of patients seeking primary healthcare with acute respiratory disease symptoms is above average in about half of the reporting countries, indicating a significant circulation of respiratory viruses.
Flu virus circulation continues to rise, with most countries now reporting widespread activity of low to moderate intensity.
Influenza A dominates all countries, with A(H3N2) driving the increase in recent weeks.
The bulletin notes the highest circulation in children aged 5-14, with increased hospitalizations in some countries affecting all age groups, particularly adults aged 65 or older.
Health authorities claim vaccination is the most effective measure for protection against severe forms of viral respiratory diseases, emphasizing that eligible individuals, especially those at higher risk, should be encouraged to get vaccinated.
