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BVDV Testing Strategy Guide—Dairy
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BVDV Testing Strategy Guide—Dairy - 1

BVDV Testing Strategy Guide—DairyTest With Confidence™ U.S. veterinarians estimate that bovine viral diarrhea virus (BVDV) costs producers more than $30 per head each year in lost productivity, even after vaccination.1 Fortunately, with an effective management strategy and the right diagnostic tools, BVDV can be controlled. IDEXX recommends this 3-step strategy for BVDV control: 1. Determine your herd status using the IDEXX BVDV PI X2 Test at a local laboratory. 2. Test all new introductions to the herd using the IDEXX SNAP® BVD Test. 3. Work with your veterinarian to design a vaccination and biosecurity program. PI (Persistently Infected) An animal infected before birth that remains infected for life and can continually infect other cattle. TI (Transiently Infected) An exposed animal whose system eventually fights off the virus. Infection lasts several days to a few weeks and makes the animal susceptible to other diseases. Dairy Farm Control Strategy • Determine herd status by testing all: - Calves (If calf is negative, dam is negative. No need to test dam.) - Cows of positive calves (If calf can’t be traced to cow, consider testing all cows.) - Open cows and bulls • Test all new introductions to the dairy, including replacement heifers and bulls. • Develop a vaccination and biosecurity program with your veterinarian. • Keep vulnerable cattle (especially pregnant cows and those of uncertain testing status) away from contact with untested cattle. • Test annually using the Surveillance Strategy and/or continue to test each calf crop. (Note: Pl-tested calves bring added value.) Surveillance Strategy • Test all: - New cattle introduced to the dairy - Aborted fetuses - Calves that die - Cows with increased somatic cell counts - Cows with mastitis - Animals treated for bovine respiratory disease (BRD) and/or other illnesses • If a PI animal is detected, implement the Control Strategy. Calf Ranch/Dairy Heifer Developer Control Strategy • Determine herd status and test new introductions by: - Purchasing BVDV-PI-tested cattle. - Testing all cattle with unknown PI status on or before arrival. • Develop a vaccination and biosecurity program with your veterinarian. Surveillance Strategy • Test all: - New cattle introduced to the farm - Cattle that die - Animals treated for BRD and/or other illnesses - Cattle in “hospital” pens/pastures with an unusually high sickness rate • If a PI animal is detected, test all cattle in that pen or pasture and consider implementing the Control Strategy. 1. Data on file at IDEXX Laboratories, Inc. Westbrook, Main

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BVDV Testing Strategy Guide—Dairy - 2

BVDV Testing Strategy Guide—Dairy Understanding How a PI Calf Is Created Is Key to Developing a BVDV Control Strategy Less common route (Less than 10%) BVDV persistently infected (PI) female becomes pregnant More common route (More than 90%) Susceptible pregnant female (non-PI) infected with BVDV at about 1½–4 months of gestation BVDV virus from any source PI calf BVDV persistently Infected (PI) calf is produced MYTH: BVDV won’t affect vaccinated cattle. FACT: tremendous amount of virus secreted by a PI calf can The overwhelm a level of immunity that is protective under less severe...

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