What to know
- New World screwworm (NWS) myiasis is an emerging threat to people and animals in the United States.
- Prompt reporting of human cases is essential for an effective response.
- Healthcare providers should notify CDC of any potential human cases of NWS through their state or local public health department.
When to report cases
Report all suspected human cases immediately to the local or state public health department (Epi on Call), followed by CDC at 404-718-4745 or parasites@cdc.gov.
Contact information
- Direct clinical inquiries and patient management-related questions to your local or state public health department (Epi on Call) or to CDC's Parasitic Diseases Hotline at parasites@cdc.gov or 404-718-4745.
- Direct clinical inquiries outside of regular business hours to CDC's Emergency Operations Center at 770-488-7100.
- Direct non-clinical questions to newworldscrewworm@cdc.gov.
Human infestations may be an indication of local circulation of flies; other people and animals may be at risk. All human cases should be reported to inform control measures.
Content Source
National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)
About This Page
Published: February 18, 2026
Updated: February 19, 2026
This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.
Reviewed: February 18, 2026
The information on this page was last reviewed by subject matter experts to ensure accuracy.