- A man got sick last summer after his pit bull became infected with the plague
- Four people who got sick with the plague from contact with the dog recovered
- On average there are eight cases of plague in the U.S. annually, most cases are in Colorado, Arizona, New Mexico, and California
(CNN)A pit bull was at the heart of a rare plague outbreak in Colorado that left four people sick last year. That's what a Centers for Disease Control and Prevention investigation found in a new report released April 30.