Epidemics and outbreaks in United States
536 epidemics and outbreaks have been recorded in United States by Global Incident Tracker, 535 of them in 2026. The most recent was on 10 October 2026. These are incidents our sources reported, not an official national total.
0
Today (UTC)
88
Last 7 days
535
In 2026
536
Total recorded
Continuous monitoring began 9 August 2026. These counters show what we have recorded since then, not everything that happened.
Most recent epidemics and outbreaks in United States
U.S. measles cases exceed 4,000 — The Hill
Minor
U.S. measles cases surpass 4,000, with over 25 percent coming from Pennsylvania
Minor
San Diego State’s Mumps Outbreak Hits 14 Confirmed Cases Before Pac-12 Debut
Moderate
Measles cases reach a 35-year high in the U.S.
Minor
Casos de dengue siguen aumentando tras las fuertes lluvias en Tampa Bay
Moderate
Hawaii reports 8th case of travel-related dengue this year - Honolulu Star-Advertiser
Moderate
City of Tampa, Health Department partner together in fight against Dengue Fever
Moderate
Washington Post. . Researchers have found that within two months of infection, measles wiped out 11 to 73 percent of the range of antibodies children had acquired over their lifetimes. Our Ask A Doctor columnist explains the consequences of catching
Moderate
Lancaster County logs 24 measles cases since Monday
Moderate
Medina County reports 1 confirmed, 1 probable measles case
Moderate
Dengue cases continue to rise after heavy rain in Tampa Bay
Moderate
Tampa crews go door-to-door to limit spread of dengue
Moderate
Fighting the spread of dengue fever in Tampa Bay counties
Moderate
U.S. measles cases top 4,000, far surpassing last year's total, CDC says
Minor
This Penn State Health pediatrician never thought he’d see measles. Now, he treats it every day. - Pittsburgh Post-Gazette
Moderate
Measles hits an Allegheny County school as outbreak accelerates - Pittsburgh Post-Gazette
Moderate
US measles cases rise to 4,080, CDC says - Fort Worth Star-Telegram
Moderate
Dengue en Tampa: autoridades visitarán cinco vecindarios ante aumento de casos en Florida
Moderate
This pediatrician never thought he’d see measles. Now, he treats it every day. - Pittsburgh Post-Gazette
Moderate
Student tests positive for measles in Lancaster County
Moderate
Taylor Farms leader says his company is taking steps in wake of huge Cyclospora outbreak
Moderate
Tras el paso del huracán Polo, Bahía de Lobos refuerza acciones contra el dengue
Moderate
Tampa Staff Go Door-to-Door as Dengue Outbreak Continues
Moderate
Elizabethtown Area School District says unsure where or when Bainbridge student contracted measles
Moderate
Dengue fever: Local state of emergency extended for some Tampa Bay area counties
Moderate
Dengue fever cases near 300 across Tampa Bay: See county-by-county numbers
Moderate
Dengue Cases Surge in Hillsborough County as Mosquito Treatments Increase
Moderate
Boston Kindergartners in Suffolk County Fall Short of 95% Measles Vaccine Mark as Pennsylvania Outbreak Keeps Growing
Moderate
Pa. measles outbreak is nation’s worst, echoing deadly 1991 Philadelphia epidemic
Moderate
Measles cases surge across the U.S. as outbreaks grow
Minor
When they happen
September carries the most epidemics and outbreaks we hold for United States — 352 of 536. This is when incidents were reported, so read a quiet month as either a quiet month or thin reporting.
| Month | Recorded | |
|---|---|---|
| January | 0 | |
| February | 0 | |
| March | 0 | |
| April | 0 | |
| May | 2 | |
| June | 0 | |
| July | 0 | |
| August | 31 | |
| September | 352 | |
| October | 150 | |
| November | 0 | |
| December | 1 |
Where this data comes from
Epidemics and outbreaks have official real-time feeds, and ours come from WHO · WHO Africa · European CDC · news.