West Nile virus

Updated 2026-10-14

vector

Outbreak map All alerts Disease directory Map filtered to West Nile virus

Source-backed reference: West Nile virus

Plain-English overview

West Nile virus circulates between birds and mosquitoes; most people have no symptoms, but agencies track neuroinvasive cases and mosquito pools.

What official signals usually mean here

Signals may be state weekly arbovirus reports, dead bird surveillance summaries, or human case line lists - each tied to a government URL.

How OutbreakThreat tracks it

We aggregate links; we do not redraw county risk tiers beyond what the state dashboard already published.

Official references

CDC - West Nile

Below, “Latest signals” pulls from our index only when a publisher URL is attached. Open each alert for the full notice. How we label sources.

Current outbreak signals

Each notice shows the publisher's event date and source. Geography is whatever that notice stated. Counts on this page are the number of ingested notices, not national case totals. Map: filtered map.

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West Nile virus- Barbados - West Nile virus - World Health Organization - event 2024-10-03

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What it is

Vector-borne diseases are transmitted by insects or arachnids such as mosquitoes and ticks.

Symptoms (general)

Symptoms vary; some infections are mild while others require medical care. See official sources for clinical guidance.

How it spreads

Spread occurs through bites from infected vectors; risk varies by geography, season, and exposure.

Prevention (general)

Prevention strategies from public health agencies include bite prevention and community control programs.

Related locations

Email when new West Nile virus notices match a saved place

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