Real Government Data · No Account Required

U.S. Disease Surveillance
Without the Runaround

ContagionWatcher pulls live data directly from the CDC's National Notifiable Diseases Surveillance System and presents it in one clean, filterable dashboard — the information that used to take 20 minutes of government website navigation, now in under 10 seconds.

Open Live Dashboard See Sample of Live Data How We Compare GitHub
22+
Notifiable diseases tracked
50
States + D.C. covered
4
Time windows (7D–1Y)
100%
Free · No login · No ads
6h
CDC cache refresh rate

Live Data Preview

What You See the Moment You Open It

No registration, no paywall. The national disease activity table below reflects real case counts pulled from CDC NNDSS — the same dataset epidemiologists use, just without the 47-click navigation.

National Disease Activity · Last 7 Days   ● CDC NNDSS
Disease Cases (7d) Prev 7d Trend
Chlamydia 9,854 13,159 ↓ Declining
Gonorrhea 2,788 4,112 ↓ Declining
Campylobacteriosis 715 811 → Stable
Salmonellosis 477 488 → Stable
Mpox (Monkeypox) 6 4 ↑ Rising

Source: CDC NNDSS dataset x9gk-5huc · Updated weekly (MMWR week) · Counts are confirmed notifiable disease reports

Features

Everything in One Place

Built for anyone who needs disease activity data — public health professionals, researchers, journalists, or curious citizens.

National Disease Trends
22 CDC-notifiable diseases ranked by current case count. Switch between 7-day, 30-day, 90-day, and yearly views with one click. Rising/stable/declining trend calculated automatically.
State-Level Lookup
Type any U.S. state, city, or abbreviation (NJ, Texas, NYC). Instantly see top diseases for that location pulled from CDC state-level NNDSS data — same period filter, real case counts.
AI Situation Report
A Claude-generated national summary refreshed every 24 hours. Plain-language analysis of what's rising, what's declining, and what to watch — no epidemiology degree required.
CSV Export
Download disease activity for any U.S. state or nationally for any time period. Includes ICD-10 codes, case counts, and per-100k population rates. Data attributed to CDC NNDSS.
U.S. Activity Map
Interactive choropleth showing disease activity density across all 50 states and D.C. Color-coded by case rate per 100k population. Hover for jurisdiction-level detail.
Real-Time Data Source
Data comes directly from CDC Open Data (dataset x9gk-5huc) — the same MMWR weekly notifiable disease reports published by the CDC every Friday. Not scraped. Not estimated.
CDC NNDSS (x9gk-5huc) — 22 notifiable diseases
Socrata Open Data API
MMWR weekly reporting cycle
Claude AI (Anthropic) — situation summaries

Competitive Analysis

How We Stack Up

A direct feature comparison with the leading disease surveillance platforms available to the public in 2026.

Feature ContagionWatcher VirusWatcher CDC NNDSS (raw)
Access ✓ Free, no login ⚠ Free tier unclear; enterprise demo required ⚠ Free but complex navigation
U.S. state-level data ✓ All 50 states + D.C. Country-level only (global focus) ⚠ Available but buried in tables
Verified government source ✓ Direct CDC NNDSS API ⚠ "CDC + 50 agencies" — not direct ✓ Primary source
Period filters ✓ 7D / 30D / 90D / 1Y Not documented Fixed MMWR week format
CSV export ✓ Per state or national, any period No public export ⚠ Raw bulk download only
AI summary ✓ Daily Claude-generated brief ⚠ AI alerts (severity flags only) None
Diseases tracked ⚠ 22 notifiable diseases ✓ 160+ diseases globally ✓ All notifiable diseases
Global coverage U.S. only (by design) ✓ 195 countries U.S. only
No-paywall public API/embed ✓ Open data attribution Enterprise plan required ⚠ Raw Socrata API (no formatting)
Trend calculation ✓ Rising / Stable / Declining vs prior period ⚠ Severity flags only None
Mobile app Web only ⚠ Android only (iOS unavailable) None
Wastewater surveillance Not yet ✓ Integrated Separate system

Roadmap

What's Coming Next

The clearest gaps against best-in-class platforms — prioritized by impact.

1
Expand Disease Coverage to 60+ High Impact
NNDSS tracks 120+ diseases. ContagionWatcher currently surfaces 22. Adding HIV/AIDS (CDC HIV Surveillance), COVID-19 (COVID tracker), Lyme Disease (NNDSS Table II), Influenza (FluView), and Norovirus would cover the diseases the public actually searches for.
2
County-Level Resolution High Impact
NNDSS data is only available at state level. CDC maintains county-level surveillance in separate systems. Integrating county FIPS-level data for the top 10 most-tracked diseases would make the location lookup dramatically more useful to urban users.
3
Wastewater Surveillance Integration High Impact
CDC's NWSS (National Wastewater Surveillance System) provides 1–2 week early-warning signals for COVID-19 and influenza. This is a clear differentiator VirusWatcher already exploits. NWSS data is free and available via API.
4
Disease Detail Pages Medium Impact
Each disease should have its own page: transmission routes, symptoms, incubation period, at-risk populations, current YTD case count with historical chart, and links to CDC resources. VirusWatcher has individual disease intelligence pages — this is a gap.
5
Historical Trend Charts Medium Impact
A sparkline or 52-week line chart per disease, showing seasonal patterns. CDC NNDSS has data back to 2014. Visualizing multi-year seasonality (e.g., West Nile peaks every August) turns a data table into genuinely actionable intelligence.
6
Email / SMS Alert Subscriptions Medium Impact
Let public users subscribe to "notify me when [disease] in [state] crosses X cases/week." VirusWatcher has this behind a paywall. Offering it free for core diseases would drive retention and word-of-mouth.