Tick Fever Tests in Dogs: Smear, Snap 4Dx and RT-PCR

A blood smear, the Snap 4Dx rapid test and RT-PCR can all help find tick fever in dogs, but each one looks for something different. A smear looks for parasites in the blood, the rapid test looks for the body's response, and RT-PCR looks for the genetic material of the germ. Vets often combine them, and a registered veterinarian reads the results with your dog's signs.

What is tick fever in dogs?

Tick fever is a common name for illnesses spread by ticks. The germs behind it include Babesia, a parasite that lives inside red blood cells, and Ehrlichia and Anaplasma, which are bacteria. A dog can carry more than one of them at the same time.

Signs may include fever, dullness, poor appetite, pale gums and weakness. These signs are shared by many illnesses, so a lab test is needed. A sick dog should see a vet promptly and should not wait for a lab report.

What can a blood smear show?

For a Blood Protozoa (Blood Parasite Smear), a drop of blood is spread thin on a glass slide, stained and examined under a microscope. Babesia can sometimes be seen inside the red cells. Ehrlichia and Anaplasma may appear as tiny clusters inside white cells or platelets, but they are hard to find.

A smear is simple and gives a quick first look. Its weakness is that parasite numbers in the blood rise and fall. A negative smear does not rule tick fever out, so a vet may repeat it or add another test.

What does the Snap 4Dx rapid test check?

The Snap 4Dx (Ehrlichia / Lyme / Heartworm / Anaplasma) is a rapid test kit. A few drops of blood or serum go into a small device, and coloured spots show the result. It looks for antibodies, which are proteins the body makes after meeting a germ, against Ehrlichia, Anaplasma and the Lyme germ. It also looks for a protein from heartworm, a worm spread by mosquitoes.

Two limits matter. Antibodies need time to appear, so a very early infection can be missed. And a positive antibody result shows that the dog has met the germ, but not always that the germ is active now. The kit also does not test for Babesia.

When is RT-PCR useful?

RT-PCR (real-time PCR) is a molecular test that looks for the genetic material of a germ in the blood. It can find a germ before antibodies appear and can tell the germs apart. The Tick Fever Panel RT-PCR (4 Strain: B. gibsoni, B. canis, E. canis & Anaplasma spp.) typically covers more than one Babesia, Ehrlichia canis and Anaplasma, and the exact list is confirmed when you book. The Ehrlichia Canis RT-PCR looks for one germ when the vet suspects it.

A negative RT-PCR does not always rule an infection out. The germ may be scarce in the blood at that moment, especially when the illness is long standing. Tell the vet and the lab about any medicine the dog has had recently, because it may affect the result.

How do vets combine these tests?

No single test is perfect, so vets choose by the dog's signs and by what they need to know:

• The smear is a quick first look for parasites.
• The rapid kit is a fast screen that shows whether the dog has met certain germs.
• RT-PCR names the germ and helps when the other tests are negative but the dog still looks ill.

A Complete Blood Count (CBC) is often added, because tick fever may lower platelets or cause anaemia, which means too few red cells. Liver and kidney checks help the vet see how the whole dog is coping.

The Tick Bone Panel groups a smear, a blood count and liver and kidney checks. The Pro Tick Bone Safety Panel adds the Snap 4Dx. Your vet can add RT-PCR or drop tests to suit your dog.

Ticks also bite people. Check your own skin after handling a tick-infested dog, and speak to a doctor if you feel unwell after a tick bite. Ask your vet about tick prevention.

Read next

For the signs of tick fever and how the tick panel tests are used, read Tick Fever in Dogs: Signs, Causes and Tick Panel Tests. This one is not about dogs, but if your family also sells milk from dairy animals, Antibiotic Residue and Aflatoxin M1 Tests in Milk explains two common milk tests.

Testing in Bhopal

For a dog with a fever or tick bites, see your vet first. For a blood sample, the lab at C-200, C Sector, Shahpura collects free anywhere in Bhopal, and it confirms the method, sample needs and reporting time when you book. Call or WhatsApp +91 88175 01118. Dog owners in other districts can send blood by courier, bus parcel or through their local vet.