COVID-19 in Portugal
Current COVID-19 activity in Portugal — based on ECDC ERVISS weekly data from the Instituto Nacional de Saúde Doutor Ricardo Jorge (INSA).
Current situation: COVID-19
In week 15 of 2026, activity of COVID-19 in Portugal is low. The trend — derived from clinical surveillance — is stable. Over a four-week comparison, a clear decline is visible.
The classification is based on the ECDC ERVISS weekly reports, drawing on COVID-19 surveillance data from the Instituto Nacional de Saúde Doutor Ricardo Jorge (INSA) via the Médicos-Sentinela network. Seasonally, infection waves in Portugal typically peak during winter, with occasional summer waves driven by new variants; activity is usually markedly lower in late spring between waves. How severe a given season becomes depends on the circulating virus variant and the population's immune status, among other factors.
Data sources and methodology
The current picture for Portugal is built on the European Respiratory Virus Surveillance Summary (ERVISS), published weekly by the European Centre for Disease Prevention and Control (ECDC). the Instituto Nacional de Saúde Doutor Ricardo Jorge (INSA) via the Médicos-Sentinela network is the national public-health authority that feeds ERVISS with sentinel primary care and virology data.
ECDC ERVISS
ERVISS is ECDC's weekly pan-European surveillance summary for influenza, SARS-CoV-2 and RSV. National authorities — in Portugal's case the Instituto Nacional de Saúde Doutor Ricardo Jorge (INSA) via the Médicos-Sentinela network — submit harmonised indicators every week, which ECDC publishes in a standardised dataset on Thursdays. Using ERVISS rather than each country's native portal ensures cross-country comparability.
ILI / ARI consultation rates and positivity
the Instituto Nacional de Saúde Doutor Ricardo Jorge (INSA) via the Médicos-Sentinela network operates a sentinel network of general practices that report weekly rates of patients consulting for influenza-like illness (ILI) or acute respiratory infection (ARI). A subset of patients is swabbed and tested by reference laboratories, producing pathogen-specific positivity rates for flu, SARS-CoV-2 and RSV.
Why this source
Combining consultation incidence with virological positivity yields a pathogen-specific weekly incidence signal (ILI × positivity / 100). This is the standard European methodology and provides a more robust view than either indicator alone — consultation rates capture illness burden, positivity confirms which pathogen is driving it.
Qualitative classification
The “low”, “moderate” and “high” categories follow seasonal reference values and epidemiological thresholds calibrated to match our classifications for other countries. The ILI × positivity / 100 product is scaled to comparable thresholds using a divisor of 3, which aligns European sentinel peaks with the consultation-equivalent scale used elsewhere. Data refreshes weekly when ECDC publishes the latest ERVISS update, typically on Thursdays.
Frequently asked questions
How is COVID-19 monitored in Portugal today?
INSA integrates COVID-19 into its broader respiratory-virus surveillance. Core indicators include sentinel-laboratory positivity, hospital and ICU admissions for severe acute respiratory infection, wastewater detection of SARS-CoV-2, and variant characterisation by the National Reference Laboratory. Portugal operates an active wastewater surveillance programme alongside clinical testing. Weekly results are reported to ECDC ERVISS.
Why does Portugal use wastewater surveillance?
As clinical testing was scaled back, INSA and partner institutions invested in wastewater-based monitoring as a cost-effective way to track SARS-CoV-2 circulation at community level. Portugal operates a wastewater surveillance programme covering major urban areas, producing indicators that complement clinical positivity and hospital data. These signals can detect rising activity ahead of hospital admissions.
When do COVID-19 waves happen in Portugal?
COVID-19 in Portugal has not settled into a strict single-season rhythm. Autumn and winter waves overlapping with flu and RSV are the most consistent pattern, but summer upticks driven by new variants have also been observed. Rising wastewater signals, positivity, and hospital-admission trends are INSA's earliest indicators of a shift from baseline to elevated activity.
Who is eligible for a COVID-19 booster in Portugal?
Portuguese autumn COVID-19 booster campaigns are coordinated by the Direção-Geral da Saúde and typically target adults aged 60 and above, pregnant women, people with chronic or immunosuppressive conditions, residents of long-term-care facilities, and healthcare workers. Vaccines are administered through primary-care units and pharmacies. INSA publishes uptake data alongside weekly virological surveillance.
Are new variants still tracked in Portugal?
Yes. INSA's National Reference Laboratory continues to sequence SARS-CoV-2 samples from hospital and sentinel cases. Most emerging lineages cause illness comparable to their predecessors, but variants with notable immune escape can drive faster waves. Portuguese variant trends are reported weekly and feed into the ECDC ERVISS platform for Europe-wide context.
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