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Other Names: Cowdriosis, Malkopsiekte, Péricardite Exsudative Infectieuse, Hidrocarditis Infecciosa, Idropericardite dei Ruminanti
Heartwater is a rickettsial disease of domestic and wild cattle, deer, sheep, and goats that is spread by infected ticks.

Disease Agents

  • Ehrlichia ruminantium

Disease Presentation

Vaccine Products

Additional Disease Specific Resources

Prevention and Control

Heartwater Prevention Practices
Provides specific prevention recommendations for beef or dairy operations to implement once Heartwater has been diagnosed in the U.S.
[English PDF] [Spanish PDF]
[English PPT] [Spanish PPT]
[English Speaker Notes] [Spanish Speaker Notes]

Heartwater Prevention Practices Checklist
Supplements the Heartwater Prevention Practices handout.
[English PDF] [Spanish PDF]

Heartwater Response Package
If Heartwater is ever diagnosed in the United States, this "response package" can get prevention information into the hands of producers and allied industries as soon as possible.
[English PDF] [Spanish PDF]


General Factsheet
Provides more detailed disease information to assist extension personnel with media interviews or general inquiries.
[English PDF] [Spanish PDF]

Disease Categories

The links in this section will take you to a list of other diseases for that same category (e.g. diseases affecting that species, in a specific region, etc.).

Species Affected


Agent Type

Clinical Signs



To cite the factsheets found on this website, the following information can be used:
Spickler, Anna Rovid. "Title of Factsheet." "Date of Factsheet (Last Updated)."