How is this data compiled?

These maps indicate recorded positives from more than 10,000 veterinary clinics and IDEXX reference Laboratories results, updated weekly to show data from the past five years. Because so many pets go untested for diseases, the actual number of affected pets is likely many times higher than what is shown here. If you have any questions or concerns, you should always visit or call your veterinarian -- they are your best resource to ensure the health and well-being of your pets.

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