The European Centre for Disease Prevention and Control (ECDC) listed eleven active communicable disease threats across the European Union for the week of 22‑28 August 2026, the latest snapshot in its weekly Communicable Disease Threats Report (CDTR).
What the weekly report covers
The CDTR is a weekly bulletin aimed at epidemiologists and health professionals. It summarises the public‑health threats that are currently active in the EU and provides updates on any changes in their epidemiology. The issue for week 35, published on 28 August 2026, covers the period 22‑28 August 2026 and enumerates eleven distinct threats.
According to the report, the list includes updates on diphtheria, Ebola, swine influenza A(H1N2), respiratory virus epidemiology, Crimean‑Congo haemorrhagic fever, dengue, chikungunya virus disease, Vibrio growth, West Nile virus, cholera, poliovirus and ongoing expert deployments. The exact wording from the ECDC bulletin reads:
“This issue of the ECDC Communicable Disease Threats Report (CDTR) … includes updates on diphtheria, Ebola, swine influenza A(H1N2), respiratory virus epidemiology, Crimean‑Congo haemorrhagic fever, dengue, chikungunya virus disease, Vibrio growth, West Nile virus, cholera, poliovirus and expert deployments.”
These excerpts are taken directly from the ECDC’s official publication for week 35.
The eleven threats in detail
While the report does not provide case numbers in this brief, it does categorise the threats by the type of pathogen involved. The eleven threats can be grouped as follows:
| Disease threat | Pathogen category |
|---|---|
| Diphtheria | Bacterial |
| Cholera | Bacterial |
| Ebola | Viral |
| Swine influenza A(H1N2) | Viral |
| Dengue | Viral |
| Chikungunya virus disease | Viral |
| West Nile virus | Viral |
| Poliovirus | Viral |
| Crimean‑Congo haemorrhagic fever | Parasitic (tick‑borne) |
| Vibrio growth | Environmental (bacterial proliferation in water) |
| Respiratory virus epidemiology (ongoing monitoring) | Viral |
| Source: ECDC Communicable Disease Threats Report, week 35 (22‑28 August 2026) | |
These threats span four broad categories: bacterial (diphtheria, cholera), viral (Ebola, swine influenza, dengue, chikungunya, West Nile, poliovirus, respiratory viruses), parasitic (Crimean‑Congo haemorrhagic fever) and environmental (Vibrio growth). The diversity of categories reflects the range of transmission routes that can become active during the late‑summer months, from water‑borne bacteria to mosquito‑borne viruses.
Why the timing matters
Late summer is traditionally a peak period for vector‑borne diseases such as dengue, chikungunya and West Nile virus, which rely on mosquito activity. At the same time, warmer sea temperatures can promote the growth of Vibrio species in coastal waters, raising the risk of food‑borne illness from raw or undercooked seafood. The inclusion of both vector‑borne and environmental threats in the same weekly bulletin underscores how seasonal factors can create a convergence of risks.
Health officials in several EU member states have already issued public‑health advisories about mosquito protection and safe handling of seafood. While the CDTR does not quantify the number of cases for each threat, the fact that they are all listed as “active” indicates that surveillance systems are detecting ongoing transmission or the potential for outbreaks.
For readers in Canada, the relevance is indirect but clear: the same seasonal drivers that affect Europe also operate in many Canadian provinces. Travel to EU destinations during this period may expose visitors to the same vector‑borne viruses, and imported goods—especially seafood—can carry Vibrio strains that survive transport.
What we still don’t know
The ECDC report provides a list of active threats but does not disclose the exact case counts, severity levels, or geographic hotspots for each disease. It also does not compare the current list with the previous week’s list, so we cannot say whether any of the eleven threats are new additions or have been removed since week 34 (15‑21 August 2026). The report mentions “ongoing expert deployments” but gives no detail on where those experts are stationed or which threats they are addressing.
Because the CDTR is a high‑level surveillance summary, deeper analysis will come from national public‑health agencies that publish weekly or daily case numbers. Until those figures are released, readers should treat the list as an indication of which pathogens are being monitored closely, rather than a measure of current disease burden.
For now, the ECDC’s weekly bulletin remains the most authoritative source on the EU’s communicable‑disease landscape for the period 22‑28 August 2026. Future updates will show whether any of the eleven threats expand, contract or are replaced by new concerns.
Looking back: week 34
The week 34 CDTR, covering 15‑21 August 2026, listed a similar set of threats, though the exact wording differed slightly. Readers interested in the week‑to‑week evolution can consult the earlier report, which is linked below.
Comparing the two weeks will help public‑health officials and the public gauge whether any disease is gaining momentum as the summer progresses.