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 Bulgaria: 2026 cases and outbreak reports

Reported respiratory syncytial virus infection surveillance for Bulgaria (BGR) — ▲ Rising · 2025 — latest record 2026-11-06

What the 2026 data shows

As of 25 May 2026, Bulgaria has reported 93 respiratory syncytial virus infection cases in 2026, as published by ECDC EU/EEA Respiratory Virus Weekly Data (GitHub). The full year 2025 closed at 146 cases. 2025 closed 81% above the 2023–2024 average, which is why the trend reads “Rising”.

Of the 34 countries reporting respiratory syncytial virus infection to ENCLAI in 2026, Bulgaria accounts for 0.0% of reported cases and ranks 27 by case count.

ENCLAI has logged 276 surveillance records for respiratory syncytial virus infection in Bulgaria in 2026, with the most detailed reporting in Apr 2026 (247 records). 5 of those arrived in the last 30 days; the case counts run to 2026-05-25. 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)
93
2025 cases (full year)
146
Baseline avg (3yr)
N/A
Trend (2025)
▲ Rising · 2025
+81% vs 2023–2024 average

Reported cases by year, Bulgaria

YearReported casesShare of worldwide reports
2023 79 0.1%
2024 82 0.1%
2025 146 0.0%
2026 (year to date) 93 0.0%

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 20262471
May 202641
Aug 2026141
Sep 202641
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 Bulgaria, 2026

Disease2026 casesTrend
Seasonal influenza 650 ▲ Rising · 2025
Measles 501 ▼ Declining · 2025
COVID-19 259 ▼ Declining · 2025

Questions about this page

How many respiratory syncytial virus infection cases has Bulgaria reported in 2026?
As of 25 May 2026, Bulgaria has reported 93 respiratory syncytial virus infection cases in 2026, as published by ECDC EU/EEA Respiratory Virus Weekly Data (GitHub). The full year 2025 closed at 146 cases. 2025 closed 81% above the 2023–2024 average, which is why the trend reads “Rising”.
Is respiratory syncytial virus infection rising or falling in Bulgaria?
ENCLAI's trend reading for respiratory syncytial virus infection in Bulgaria is “Rising · 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 Bulgaria 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. Bulgaria 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 Bulgaria dated from 2021. How we verify and update data: methodology & Trust Center · understanding case counts.

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The daily disease brief

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.