To New Jersey Dairy Producers and Dairy Cattle Owners:

There has been a rise in HPAI detections in domestic poultry and dairy cattle, particularly in western states, over the past few months. The U.S. Center for Disease Control (CDC) has also reported over 60 human cases related to individuals who had close contact with infected livestock or poultry. While H5N1 bird flu currently has not been detected in dairy cattle or people in New Jersey, due to the ongoing outbreaks in other states, New Jersey farm owners and farm workers should be aware of the risks and monitor dairy cattle, domestic poultry, other livestock, farm pets, and farm workers for signs of illness. Cattle farms should identify areas of potential improvement in biosecurity, including limiting farm access to essential employees only, cleaning and disinfection of vehicles, implementing strategies for wild bird determent, and use of footbaths at barn entryways. Multi-species operations, particularly those with both poultry and ruminants on-site, are encouraged to mitigate areas in which the spread of disease between species may be at risk.

For resources regarding biosecurity plans, please refer to the memo from Dr. Amar Patil, DVM, MVSc, Ph.D., Diplomate ACVM, Director of the Division of Animal Health/State Veterinarian: December 2024 HPAI Letter to Dairy Owners

Also, New Jersey has developed a Voluntary Dairy Herd Health Monitoring Program which is available to all dairies in the state. If you are interested in learning more about this program, please contact Dan Wunderlich (Daniel.Wunderlich@ag.nj.gov) at the New Jersey Department of Agriculture.

To Backyard Flock Poultry Owners:

Highly pathogenic avian influenza (HPAI) has been confirmed (by USDA Animal and Plant Health Inspection Service (APHIS)) in commercial and backyard flocks throughout the nation since 2022. The HPAI virus remains present in wild birds and other wildlife, as well as domestic poultry and livestock in the United States. As HPAI continues to spread across the country, poultry owners are urged to review their biosecurity practices and remain on alert for clinical signs of HPAI in their flock. Multi-species operations, particularly those with both poultry and ruminants on-site, are encouraged to mitigate areas in which the spread of disease between species may be at risk.

For resources regarding biosecurity plans, please refer to the memo from Dr. Amar Patil, DVM, MVSc, Ph.D., Diplomate ACVM, Director of the Division of Animal Health/State Veterinarian: Dec 2024 HPAI Letter to BYF Poultry Owners

I’ve included for you a memo from the New Jersey Department of Agriculture regarding Theileria orientalis subtype Ikeda found in NJ.

Theileria orientalis Ikeda is a tickborne protozoan infection in cattle (but can impact sheep and goats) that is most commonly spread through the bite of an ixodid tick. An emerging vector for this disease is the Asian longhorned tick (Haemaphysalis longicornis), a tick that was first identified in Hunterdon County in 2017 and has since been detected in 21 states and DC. This tick is active in New Jersey from March through October or early November (Ticks Don’t Take a Winter Vacation).

Well, what will happen if animals get bitten by an infected tick?

• The T. orientalis Ikeda protozoa will infect the red and white blood cells, which results in anemia in affected animals.
  • Due to anemia, infected cattle may appear similar to those affected by anaplasmosis.
•  Common clinical signs include weakness, inappetence, pyrexia (elevated body temperature), mucosal pallor (pale gums/mucus membranes), jaundice, and elevated respiratory and heart rates.

T. orientalis Ikeda infections have been reported to cause mortality in 1- 5% of infected cattle but can be as high as 50%. Pregnant heifers and calves are particularly susceptible to infection. While there are several types of T. orientalis found in the United States, to date, only T. orientalis genotype Ikeda has been shown to cause severe illness in animals.

How do you control it?

• There is no approved treatment or vaccine for T. orientalis in cattle in the United States.
• The best method of prevention is tick control. Recommended strategies include:
  • Veterinary-approved pesticide treatment (such as pour-on and ear tags)
  • Regular tick inspections
  • Clearing of bushes
  • Keeping pastures and grass mowed short.

A useful document can be found here: Managing the Asian Longhorned Tick: Checklist for Best Management Practices for Cattle Producers

The NJDA Animal Health Diagnostic Laboratory (AHDL) is currently working to coordinate diagnostic testing for T. orientalis. For further information on testing, veterinarians should contact the laboratory at (609) 406-6999 or via email at jerseyvetlab@ag.nj.gov. As an emerging disease in New Jersey, knowing detected cases of T. orientalis can help determine the impact of this disease on New Jersey cattle.