Last Modified: June 23, 2025
A man and women looking at paperwork with cows in the background

The U.S. Department of Agriculture, Food and Drug Administration, Centers for Disease Control and Prevention, and State veterinary and public health officials continue responding to detections of HPAI in livestock. 

Our collaborative efforts are helping to protect farmworkers and farmers, the health and welfare of livestock animals, and the safety of our Nation’s food supply. As the situation evolves, we will continue to post updated information below.

Announcements

3/20/25
USDA Announces Next Steps in the Effort to Support the Fight Against Avian Influenza 
3/19/25
USDA Announces Biosecurity Assessments and Audits to Support Avian Influenza Prevention
3/17/25
APHIS Confirms H7N9 Highly Pathogenic Avian Influenza (HPAI) in a U.S. Flock
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Situation Updates

HPAI Confirmed Cases in Livestock (USDA-APHIS)
Many cows in a field on a farm
H5N1 and U.S. Meat Supply Safety (USDA-FSIS)
brown cows in a green field
HPAI and Milk Safety Updates (FDA)
farmer pouring milk from one container into another
Human Health and H5N1 Bird Flu (CDC)

Science and Research

What's New?

6/23/2025 | Technical Brief: Estimating the Probability of HPAI Detection in Bulk Tank Milk at Various Sampling Times Using Disease Event Surveillance Data

This technical brief presents regression models and their use in evaluating bulk tank milk-based HPAI surveillance schemes.

View the Brief (800.64 KB)

6/20/2025 | Epidemiological Bulletin: 2024 Highly Pathogenic Avian Influenza (H5N1) Livestock Event—Nevada and Arizona H5N1 D1.1 HPAI Dairy Investigation

This technical brief provides an interim update on highly pathogenic avian influenza spillover events detected in Nevada and Arizona via the National Milk Testing Strategy.

View the Brief (149.53 KB)

Previous Updates

DateTitle
5/6/25National Epidemiologic Brief: HPAI H5N1 Genotype B3.13 in Dairy Cattle (4.25 MB)
2/7/25 The Occurrence of Another HPAI Spillover From Wild Birds into Dairy Cattle (188.48 KB)
10/4/24 U.S. Government HPAI Research Priorities
9/24/24National Epidemiologic Brief: HPAI H5N1 Genotype B3.13 in Dairy Cattle (2.71 MB)
8/28/24 CVB Notice 24-13: Field Studies With Nonviable, Non-Replicating Veterinary Vaccines Targeting HPAI in Livestock
8/15/24USDA Provides Information on Second Retail Sampling Survey
8/13/24FSIS To Start H5N1 Beef Monitoring Sampling
7/17/24Cow “Challenge” Study Should Help Turn Tables on H5N1 in Dairy Herds 
6/9/24Highly Pathogenic Avian Influenza (H5N1) Epidemiological Multi-State Summary—June 9, 2024
6/8/24Highly Pathogenic Avian Influenza (H5N1) National Epidemiological Brief—June 8, 2024