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Measles Wastewater Signal

CDC NWSS · County-Level Viral Surveillance · USA

ANIMATED TIMELINE

Counties Monitored

323

unique FIPS codes

Time Period

2024-12 → 2026-02

15 monthly snapshots

Peak Signal (log₁₀)

4.21

max log-scaled viral concentration

High-Signal Readings

117

≥75% of peak signal

Monthly Viral Signal Map

Use the play button or slider below the map to animate through months

Low

High Signal

Signal Metric

Viral concentration values are log₁₀-transformed to improve visual contrast across wide dynamic ranges.

Display = log₁₀(mean PCR concentration + 1)

Dark Red — High viral signal detected
Light — Low or absent signal

Data Sources

Wastewater Surveillance
CDC National Wastewater Surveillance System (NWSS)

Field
PCR Target Average Concentration (Linear)

Geography
Plotly county GeoJSON (FIPS-matched)

Analysis by Akshaya Bhagavathula · 2025