Surveillance

NNDSS Weekly Tables

The National Notifiable Diseases Surveillance System (NNDSS) publishes weekly tables of state-reported case counts for conditions including hantavirus infection. The tables are a foundational U.S. surveillance feed — and they typically lag.

Key facts

Cadence: Weekly
Publisher: CDC
Scope: U.S. notifiable diseases
Typical lag: 1 – 2 weeks
Revisions: Common
Hantavirus row: Yes (HPS broken out)

What NNDSS is

NNDSS is the system through which U.S. state and territorial health departments voluntarily share standardized case data with CDC. Hantavirus infection is a nationally notifiable condition; cases that meet the reporting case definition flow into the weekly tables.

How tables flow

Movement from clinician to weekly table is multi-step, and each step takes time.

Clinician reports a suspected case to the local or state health department.
Jurisdiction confirms the case against the standardized case definition.
State submits the case to CDC via the NNDSS pipeline.
Case appears in the next applicable weekly table after submission.

How to read the tables with caution

Weekly tables show movement, not certainty. Numbers shift as states submit late entries, reclassify probable to confirmed, or correct prior data. A single week's table is a snapshot, not a final count.

Where hantavirus appears

NNDSS publishes hantavirus infection rows in its weekly tables, including a breakdown for hantavirus pulmonary syndrome. Counts are state-by-state with cumulative columns alongside the current week.

Common lag and revision behavior

These are the patterns to expect when comparing a current NNDSS table to a previous one.

1–2 week reporting lag is typical for newly identified cases.
Late entries can change a quarter's total weeks after the quarter closes.
Reclassifications can move a record from probable to confirmed or vice versa.

Related on HantaScan

U.S. Monitoring Reported U.S. Cases Sources Current Situation

Primary Sources

CDC Hantavirus CDC Prevention CDC Clinical Overview