At a glance
Please note that CDC cannot respond to questions about individual medical cases, provide second opinions, or make specific recommendations regarding therapy. Those issues should be addressed directly with your health care provider.
Content Source
National Center for Environmental Health; Division of Laboratory Sciences
About This Page
Published: May 15, 2024
Updated: August 6, 2026
This page was last updated on this date. Updates may include minor edits, image changes, or other modifications to page content.
Reviewed: August 6, 2026
The information on this page was last reviewed by subject matter experts to ensure accuracy.