Compiled by the ENCLAI research team following a documented methodology · Editorial oversight: Dr Natalya Mathur, Founder · Data last updated: (UTC)

Respiratory syncytial virus infection in Belgium: 2026 cases and outbreak reports

Reported respiratory syncytial virus infection surveillance for Belgium (BEL) — ▼ Declining · 2025 — latest record 2026-11-06

What the 2026 data shows

As of 26 October 2026, Belgium has reported 4,628 respiratory syncytial virus infection cases in 2026, as published by ECDC EU/EEA Respiratory Virus Weekly Data (GitHub). The full year 2025 closed at 8,210 cases. 2025 closed 29% below the 2023–2024 average, which is why the trend reads “Declining”.

Of the 34 countries reporting respiratory syncytial virus infection to ENCLAI in 2026, Belgium accounts for 1.2% of reported cases and ranks 9 by case count.

ENCLAI has logged 232 surveillance records for respiratory syncytial virus infection in Belgium in 2026, with the most detailed reporting in Apr 2026 (206 records). 5 of those arrived in the last 30 days; the case counts run to 2026-10-26. 1 distinct surveillance sources reported this pair in 2026.

Reporting authorities for these counts: ECDC EU/EEA Respiratory Virus Weekly Data (GitHub)

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Surveillance summary

2026 cases (YTD)
4,628
2025 cases (full year)
8,210
Baseline avg (3yr)
N/A
Trend (2025)
▼ Declining · 2025
-29% vs 2023–2024 average

Reported cases by year, Belgium

YearReported casesShare of worldwide reports
2023 14,550 18.3%
2024 8,578 7.5%
2025 8,210 2.3%
2026 (year to date) 4,628 1.2%

Reporting bounds and case definitions vary; historical baselines are a separate comparison measure. Worldwide share compares this country's reported figure with the sum of all countries reporting respiratory syncytial virus infection to ENCLAI for that year. "Incomplete year" means our sources cover less than ten months of that year, so no full-year figure is shown; "outbreak total to date" is a running total since an outbreak began, not a count for one year.

Surveillance records logged in 2026

MonthRecordsReporting sources
Apr 20262061
May 202641
Aug 2026131
Sep 202621
Oct 202661
Nov 202611

A record is one dated surveillance publication or one row of an official table; a month with many records is a month with detailed reporting, not necessarily more cases. 5 records were logged in the last 30 days.

Respiratory syncytial virus infection in other countries, 2026

Country2026 casesTrend
Australia 138,359
Poland 76,067 ≈ Stable · 2025
Germany 66,160 ▲ Rising · 2025
Canada 22,576
Norway 14,243 ▲ Rising · 2025

Other diseases reported in Belgium, 2026

Disease2026 casesTrend
Seasonal influenza 17,244 ▲ Rising · 2025
COVID-19 4,418 ▼ Declining · 2025
Measles 42 ▼ Declining · 2025
Non-typhoidal salmonellosis 15 (outbreak total to date)

Questions about this page

How many respiratory syncytial virus infection cases has Belgium reported in 2026?
As of 26 October 2026, Belgium has reported 4,628 respiratory syncytial virus infection cases in 2026, as published by ECDC EU/EEA Respiratory Virus Weekly Data (GitHub). The full year 2025 closed at 8,210 cases. 2025 closed 29% below the 2023–2024 average, which is why the trend reads “Declining”.
Is respiratory syncytial virus infection rising or falling in Belgium?
ENCLAI's trend reading for respiratory syncytial virus infection in Belgium is “Declining · 2025”: the latest complete year is compared with the earlier baseline from the reported counts; the current year is not judged until it closes.
Where does Belgium publish respiratory syncytial virus infection surveillance data?
The counts on this page were published by ECDC EU/EEA Respiratory Virus Weekly Data (GitHub). ENCLAI compiles and normalises them and is not affiliated with these authorities.

About this data

Figures are reported case counts as published by the originating health authorities, compiled by ENCLAI from 444 verified surveillance sources. Belgium figures reflect the reporting available to ENCLAI; reporting periods and case definitions differ between sources, and a missing report does not establish zero cases. ENCLAI holds respiratory syncytial virus infection records for Belgium dated from 2021. How we verify and update data: methodology & Trust Center · understanding case counts.

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One email a day: what changed in official disease reporting worldwide, with the source named for every number. Reported facts only — no forecasts and no interpretation.

Double opt-in — we send a confirmation link and nothing else until you click it. One-click unsubscribe on every email. See our privacy notice.