What's going around in the United Kingdom?
Influenza: no current data, COVID-19: Moderate, RSV: no current data
Some. COVID-19 is at moderate activity in the United Kingdom; the other pathogens have no current data (as of 18 Oct 2026).
Data window: Week 42 · Oct 12 – Oct 18 · Source: UKHSA (weekly) · Next update Thu, Oct 29
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Current activity
Source: UKHSA Dashboard, UKHSA Influenza, UKHSA RSV. Published weekly, about one week behind.
Frequently asked questions
How is overall respiratory-illness activity tracked in the UK?
UKHSA publishes a combined weekly surveillance report covering influenza, COVID-19, RSV, and other respiratory pathogens, alongside the UKHSA Dashboard. The picture is built from GP consultations via the RCGP sentinel network, hospital admissions and critical care data from SARI-Watch, and laboratory-confirmed cases. On infectrisk.com we summarise the combined picture qualitatively as low, moderate, or high rather than publishing raw case counts.
Did the UK experience a “tripledemic”?
“Tripledemic” is shorthand for the simultaneous winter circulation of flu, COVID-19, and RSV, a pattern first widely reported in the 2022–2023 season. The UK saw clear co-circulation of all three pathogens that winter, with significant pressure on NHS urgent and emergency care. Since then co-circulation has become the norm each winter, even if the relative intensity of each pathogen varies.
Why do respiratory illnesses peak in a UK winter?
Several drivers line up. Many respiratory viruses remain stable for longer in cold, dry indoor air, and heated buildings reduce humidity in ways that impair airway defence. People gather indoors more during winter, schools act as mixing points, and darker days change behaviour in ways that increase close contact. The net effect is that transmission rises just as immunity to seasonal strains is at its lowest.
What is “immune debt”?
“Immune debt” describes the idea that when pathogens circulate at very low levels for a prolonged period, as during the COVID-19 restrictions, population-level immunity to them gradually declines. Subsequent seasons can then be unusually severe because fewer people have recent immune exposure. It is a temporary catch-up effect rather than a permanent change, and it partly explains the heavy UK RSV and flu seasons that followed the pandemic.
How does UKHSA decide that activity is “high”?
UKHSA uses thresholds derived from historical surveillance data. Current GP consultation rates, hospitalisations, and positivity are compared against baselines from past non-epidemic weeks and against severe-season reference points. When several indicators cross into elevated ranges at the same time, the weekly report classifies activity as high or very high. These data-driven bands help separate ordinary seasonal movement from genuine surges.