Respiratory season
Influenza and RSV test positivity each week, as published by each country's public health agency. Data as of 30 October 2026.
influenza 2025–26influenza 2026–27RSV 2025–26RSV 2026–27weeks the source calls incomplete
England
data to 25 Oct 2026UK Health Security Agency: the share of people tested by PCR who had a positive result in the week (Monday to Sunday), by specimen date, from all PCR testing, England only (UKHSA publishes no UK figure); reported weekly in autumn and winter and fortnightly in summer
Collected 30 Oct 2026 · next 5 Nov 2026
Revised by the source: 15 earlier weeks since 25 Sep 2026; the largest, the week to 20 Sep 2026, from 0.37 to 0.81
Germany
data to 4 Oct 2026ECDC (ERVISS): the share of swabs from primary-care sentinel practices that tested positive, ISO weeks (Monday to Sunday); ECDC relays the national figures and revises them retrospectively
Released 30 Oct 2026
Netherlands
data to 25 Oct 2026ECDC (ERVISS): the share of swabs from primary-care sentinel practices that tested positive, ISO weeks (Monday to Sunday); ECDC relays the national figures and revises them retrospectively; few swabs are taken out of season
Released 30 Oct 2026
Revised by the source: 4 earlier weeks since 19 Sep 2026; the largest, the week to 6 Sep 2026, from 0 to 11.1
United States
data to 24 Oct 2026 (latest week incomplete)CDC: the share of specimens tested by clinical laboratories that were positive, MMWR weeks ending Saturday, national; unsmoothed weekly figures; NREVSS describes its latest RSV week as incomplete
Collected 31 Oct 2026
Revised by the source: 46 earlier weeks since 11 Sep 2026; the largest, the week to 26 Sep 2026, from 3.43 to 3.1
| Country | Latest week ending | % positive | Week before | Change (points) | Tests that week | Source release |
|---|---|---|---|---|---|---|
| England, influenza | 25 Oct 2026 | 6.3 | 5.9 | +0.5 | retrieved 30 Oct 2026 | |
| England, RSV | 25 Oct 2026 | 1.5 | 0.9 | +0.5 | retrieved 30 Oct 2026 | |
| Germany, influenza | 4 Oct 2026 | 4.3 | 0.0 | +4.3 | 94 | 30 Oct 2026 |
| Germany, RSV | 4 Oct 2026 | 0.0 | 0.0 | +0.0 | 94 | 30 Oct 2026 |
| Netherlands, influenza | 25 Oct 2026 | 3.3 | 2.2 | +1.1 | 30 | 30 Oct 2026 |
| Netherlands, RSV | 25 Oct 2026 | 0.0 | 2.2 | -2.2 | 30 | 30 Oct 2026 |
| United States, influenza | 24 Oct 2026 | 7.6 | 6.0 | +1.7 | 53,102 | retrieved 31 Oct 2026 |
| United States, RSV† | 17 Oct 2026 | 0.9 | 0.7 | +0.2 | 57,387 | retrieved 31 Oct 2026 |
Download the whole series: CSV · JSON, with every release collected
Method note
The tracker shows, for each week, the share of influenza tests and of RSV tests that came back positive, as each agency publishes it. Positivity is not the number of people infected. It depends on who is tested, how many are tested and why. We do not adjust, smooth or model the figures.
The agencies test different groups, so the height of one country's line does not compare with another's; what compares is the shape of each line through the season. England's figures are UKHSA's: the share of people given a PCR test in the week who had a positive result, from all PCR testing, by specimen date. UKHSA publishes no figure for the United Kingdom as a whole. Germany's and the Netherlands' figures are the primary-care sentinel positivity that the national agencies report to ECDC and WHO Europe, published through ERVISS, the European respiratory virus surveillance summary. These are swabs taken from patients seen by a network of general practices. The United States' figures are CDC's: influenza from clinical laboratories and RSV from the national NREVSS network.
Out of season few swabs are taken, so a single positive can move the percentage a long way. Where the source gives it, the table shows how many tests stood behind the latest figure. Recent weeks change as results arrive. UKHSA flags weeks still within its reporting delay, and CDC describes the latest RSV week as incomplete, so those weeks are drawn dashed. ECDC revises the European figures retrospectively.
Japan publishes no weekly test positivity, so it is not included. Denmark is not included either: its figures come from Statens Serum Institut, whose terms do not allow them to be republished.
Every release collected is kept, so revisions to past weeks can be traced. The most recent are listed under Revisions below. The JSON download holds the releases themselves.
Sources and licences
- England: UK Health Security Agency, UKHSA data dashboard, influenza and RSV testing positivity by week, England. Vintage used: the figures as retrieved on 30 Oct 2026 (the source gives no release date). Next release: 5 Nov 2026, as announced by UKHSA. The share of people tested by PCR who had a positive result in the week (Monday to Sunday), by specimen date, from all PCR testing, England only (UKHSA publishes no UK figure); reported weekly in autumn and winter and fortnightly in summer. Licence: Open Government Licence v3.0. Source: UK Health Security Agency, licensed under the Open Government Licence v3.0.
- Germany: ECDC and WHO Europe, European Respiratory Virus Surveillance Summary (ERVISS), primary-care sentinel test positivity. Vintage used: the release of 30 Oct 2026. The share of swabs from primary-care sentinel practices that tested positive, ISO weeks (Monday to Sunday); ECDC relays the national figures and revises them retrospectively. Licence: CC BY 4.0. Dataset provided by ECDC based on data provided by public health authorities, scientific institutes or health care providers in the relevant reporting countries and/or by WHO.
- Netherlands: ECDC and WHO Europe, European Respiratory Virus Surveillance Summary (ERVISS), primary-care sentinel test positivity. Vintage used: the release of 30 Oct 2026. The share of swabs from primary-care sentinel practices that tested positive, ISO weeks (Monday to Sunday); ECDC relays the national figures and revises them retrospectively; few swabs are taken out of season. Licence: CC BY 4.0. Dataset provided by ECDC based on data provided by public health authorities, scientific institutes or health care providers in the relevant reporting countries and/or by WHO.
- United States: CDC — influenza percent positive from clinical laboratories (WHO/NREVSS, FluView); RSV percent positive, NREVSS national (data.cdc.gov rgnm-fkqb). Vintage used: the figures as retrieved on 31 Oct 2026 (the source gives no release date). The share of specimens tested by clinical laboratories that were positive, MMWR weeks ending Saturday, national; unsmoothed weekly figures; NREVSS describes its latest RSV week as incomplete. Licence: Public domain (US Government work). Source: CDC. Use of this material does not imply endorsement by CDC.
Japan publishes no weekly test positivity for influenza or RSV in machine-readable form; its sentinel surveillance reports cases per reporting site, which is a different measure.
Denmark is not included. Its figures come from Statens Serum Institut, whose terms do not allow them to be republished.
Revisions
Changes a source has made to its own past figures since this tracker began collecting.
- 31 Oct 2026, United States, influenza: 6 earlier week(s) revised; the largest change was the week ending 2026-10-17, from 5.7 to 6.0.
- 31 Oct 2026, United States, RSV: 7 earlier week(s) revised; the largest change was the week ending 2026-10-17, from 0.8 to 0.9.
- 31 Oct 2026, Netherlands, influenza: 1 earlier week(s) revised; the largest change was the week ending 2026-10-18, from 0.0 to 2.2.
- 31 Oct 2026, Netherlands, RSV: 1 earlier week(s) revised; the largest change was the week ending 2026-10-18, from 4.2 to 2.2.
- 30 Oct 2026, England, influenza: 5 earlier week(s) revised; the largest change was the week ending 2017-10-15, from 2.2 to 2.5.
- 30 Oct 2026, England, RSV: 5 earlier week(s) revised; the largest change was the week ending 2026-10-04, from 0.4 to 0.7.
- 24 Oct 2026, United States, influenza: 7 earlier week(s) revised; the largest change was the week ending 2026-10-10, from 5.0 to 4.6.
- 24 Oct 2026, United States, RSV: 4 earlier week(s) revised; the largest change was the week ending 2026-10-10, from 0.7 to 0.7.
- 24 Oct 2026, Netherlands, influenza: 1 earlier week(s) revised; the largest change was the week ending 2026-10-11, from 2.7 to 2.0.
- 24 Oct 2026, England, influenza: 6 earlier week(s) revised; the largest change was the week ending 2025-10-12, from 6.7 to 6.3.
Download
CSV of the whole series · JSON, with every release collected