The Merial

Heartworm

Window of Infection

WAS THERE A GAP IN PREVENTION THAT LEFT THIS DOG SUSCEPTIBLE?

Mosquitos infecting a dog with heartworm

The “Window of Infection” is the time frame when a dog was likely infected with Dirofilaria immitis to result in a positive test for adult heartworm.

This time frame is based on the pet’s heartworm testing history and the life-cycle of Dirofilaria immitis. It extends from 6-9 months prior to the dog’s last negative test up to 6 months before the current positive test.

AN EXAMPLE

BABY’s WINDOW OF INFECTION

Baby, a dog with heartworm
Baby’s test results Purchase history
DATE RESULT DATE DOSES IN PACK DOGS PER PACK
03/15/2015 POS 09/12/2014 12 2
01/16/2014 NEG 03/18/2014 12 2
01/11/2013 NEG 09/14/2013 12 2
    01/11/2013 6 1
The window of infection graph for Baby