Norovirus infections began to surge throughout the U.S. in late 2024, as they tend to do in the fall and winter. Hover over the chart below to explore weekly trends (as three-week moving averages) in test positivity nationwide and in four U.S. Census regions: Northeast, Midwest, South, and West.
WEEK END DATES SHOWN • DATA CURRENT AS OF Jan. 27, 2025 • NORTHEAST: CONNECTICUT, MAINE, MASSACHUSETTS, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, PENNSYLVANIA, RHODE ISLAND, VERMONT • MIDWEST: DAKOTAS, ILLINOIS, INDIANA, IOWA, KANSAS, MICHIGAN, MINNESOTA, MISSOURI, NEBRASKA, OHIO, WISCONSIN • SOUTH: ALABAMA, ARKANSAS, CAROLINAS, DELAWARE, DISTRICT OF COLUMBIA, FLORIDA, GEORGIA, KENTUCKY, LOUISIANA, MARYLAND, MISSISSIPPI, OKLAHOMA, TENNESSEE, TEXAS, VIRGINIAS • WEST: ALASKA, ARIZONA, CALIFORNIA, COLORADO, HAWAII, IDAHO, MONTANA, NEVADA, NEW MEXICO, OREGON, UTAH, WASHINGTON, WYOMING