NNDSS - TABLE 1U. Leptospirosis to Listeriosis, Probable

Provisional weekly counts of nationally notifiable diseases from the National Notifiable Diseases Surveillance System (NNDSS) for the United States, U.S. territories, and Non-U.S. residents for 2019 and 2020. The data is published by the CDC and includes counts for Leptospirosis and Listeriosis, broken down by confirmed and probable cases, with year-to-date and historical maximum figures. Case counts are provisional and subject to change as follow-up information becomes available.

Use Cases

• Track weekly disease incidence trends using `MMWR Year`, `MMWR Week`, `Current week`, and `Cum 2020†` columns.
• Compare confirmed versus probable case classifications for Listeriosis using the `Listeriosis§, Confirmed` and `Listeriosis§, Probable` column groups.
• Analyze geographic distribution of cases across states and counties using `Location 1`, `Counties`, `States`, and `Reporting Area` columns.
• Assess data reporting completeness and anomalies by interpreting `flag` columns and footnotes (e.g., 'U' for unavailable).

Strengths

• Data is sourced from the authoritative National Notifiable Diseases Surveillance System (NNDSS) run by the CDC.
• Includes multiple temporal aggregations: current week, cumulative year-to-date (`Cum`), and previous 52-week maximum (`Previous 52 weeks Max†`).
• Provides detailed footnotes explaining data quality flags (U, -, N, NN, NP, NC) for interpreting missing or unreported data.

Limitations

• Case counts for 2019 and 2020 are provisional and subject to change, as noted in the description.
• Row count and total dataset size are unknown, which may limit suitability assessment for large-scale analysis.
• Last updated 2021-01-07 19:20:14; freshness should be verified for current research.

Provenance

Source

data.cdc.gov, representing the National Notifiable Diseases Surveillance System (NNDSS).

Collection Method

Collated from reports submitted by state health departments, New York City, the District of Columbia, and U.S. territories to the CDC.

Time Range

2019-2020, with weekly granularity (`MMWR Week`).

Freshness

Last updated 2021-01-07 19:20:14; update frequency appears to be weekly based on the surveillance system.

Geography

United States, U.S. territories, and includes a category for Non-U.S. residents.