The respiratory virus season begins each year on the Sunday of MMWR week 40. For the 2024-2025 respiratory season, week 40 began on September 29, 2024.
Data is reported in the Morbidity and Mortality Weekly Report
(MMWR). Each MMWR week is a seven-day period known as an epidemiological week, starting on Sunday and ending on Saturday. The 365 days of the year are divided into up to 53 epidemiological weeks, forming what is known as the epidemiological year, a standard tool used by surveillance epidemiologists.
Each week, local and state health departments submit reportable and notifiable disease data (both infectious and non-infectious) to the National Notifiable Disease Surveillance System (NNDSS), a nationwide collaboration. The CDC disseminates this data through weekly electronic tables and reports via the CDC Wide-ranging Online Data for Epidemiologic Research (WONDER) system and Data.cdc.gov.
Please review the document, “ Additional Information on Data Sources,” for a more detailed summary of the data and the sources. Current and historic USET TEC surveillance reports are linked on the USET website here.
As always, if you would like a report that tracks different statistics, or if you have questions regarding this report, please do not hesitate to contact to usetepi@usetinc.org.
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