**This product is being discontinued and only available while supplies last.

  • Category: Vaccine & Wormer
  • Brand: Merial
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POTOMAVAC™ contains inactivated Ehrlichia risticii bacterian (Potomac Horse Fever).
Powerful protection against Potomac Horse Fever.

MERIAL® Equine POTOMAVAC™ provides protection against the potentially fatal equine disease Potomac horse fever (PHF). Shown to be 100% effective in protecting against mortality and 86% effective against the clinical disease itself.

-  Administer to healthy horses 3 months of age and older, booster 3-4 weeks later.
-  Annual booster.
-  Safe for use in pregnant mares.

NOTE: 5x1 dose vial pack does NOT include needles/syringes.

*NOTE:  If you need just 2 or 3 doses consider the 5x1 dose pack and save the extra doses for next season.  They are individual vials that would store well, just check the expiration date to make sure you will be able to use the extras in time.

VACCINE ORDER SHIPPING:  All vaccine orders will be shipped Next Day Air ($35.00) or 2-day air ($22.00) – options provided at checkout.  All vaccines are shipped with ice packs in an insulated pack for maximum protection.  Next Day Air packages are shipped Monday-Thursday; 2-day air packages are shipped Monday-Wednesday to insure package does not sit in transit over the weekend.

People who live in MN, IA, SD, ND, NE, IL or WI may be eligible for ground shipping if so desired.  Please call 800-328-6652 to place your order and request SpeeDee delivery.



Vaccine orders are shipped Next Day Air or 2-Day Air only (rates below).  People who live in MN, IA, SD, ND, NE, IL or WI may be eligible for ground shipping if so desired - please call 800-328-6652 to place order.


Orders placed over the weekend (Friday after 3PM/Saturday/Sunday) will be shipped the following Monday.  All vaccines orders are shipped to be received within the same week (ie. Any order placed Wednesday (after 3 p.m. CST), Thursday or Friday to ship 2 day air, we will hold your order to ship on the following Monday).  No vaccines will be shipped on a Friday.

2-DAY AIR:  $22.00
Next Day Air:  $35.00

NOTE  Express order delivery time:  Example:  2 day air (2 business days) - if your order ships on Monday, you will receive it Wednesday.  Air shipping Flat Rates apply to FedEx service only.  Vaccines are not shipped on Fridays - NO Saturday express deliveries unless requested (additional express charges will apply).

WEATHER DELAYS:  We are not able to reimburse air charges due to inclement weather that is not in our control.

If shipping to a commercial address: Your package will be delivered during the work week (Monday through Friday).








Ehrlichia Risticii Bacterin



DESCRIPTION: EQUINE POTOMAVAC™ is a liquid suspension of inactivated Ehrlichia risticii. Safety and efficacy of this product have been demonstrated in controlled vaccination challenge tests and in thorough field evaluations.


INDICATIONS: Recommended for the vaccination of healthy horses as an aid in the prevention of Potomac Horse Fever (equine monocytic ehrlichiosis) caused by E. risticii.


DOSAGE: For primary vaccination, aseptically inject 1 mL (1 dose) intramuscularly into healthy horses 3 months of age or older. Revaccinate with a second 1 mL dose 3 to 4 weeks later. Revaccinate annually with a single 1 mL dose.


PRECAUTIONS: Store at 2-7°C (35-45°F). Do not freeze. Use entire contents when first opened. Shake well before using. Contains gentamicin as a preservative. Do not vaccinate within 21 days prior to slaughter. In rare instances, administration of vaccines may cause lethargy, fever, and inflammatory or hypersensitivity types of reactions. Treatment may include antihistamines, anti-inflammatories, and/or epinephrine. Vaccinating animals whose immune response is compromised by stress, disease, etc. may not produce the desired results.


For Veterinary Use Only.

™POTOMAVAC is a trademark of MERIAL.


SKU:  Size Exp Date Sale Price Quantity
55040154 5x1 dose Product Expires 12/3/21 Sale! Reg: $109.95 $89.95

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