Respiratory symptoms got you breathless? Try our equine respiratory PCR panel -- we test for 7 respiratory bacteria and viruses from 1 swab.

Neurological symptoms got you down? Try our equine neurological PCR panel -- we test for 5 neurological diseases from 1 CSF or tissue sample.

Diarrhea got you on the run? Try our equine GI / diarrhea PCR panel -- we test for 4 GI diseases from 1 fecal or swab sample.

Oh baby! Our equine breeding/abortion PCR panel tests for 5 diseases affecting breeding success from 1 swab or semen sample.

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For our international clients: Our DRY CARDS let you mail blood samples to Zoologix easily and cheaply from anywhere. Samples are small, light and stable at room temperature.

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Zoologix performs equine PCR tests for...

African horse sickness

Anaplasma phagocytophilum



Borrelia burgdorferi

Burkholderia mallei and pseudomallei

Clostridium difficile

Clostridium species

Contagious equine metritis (CEM)



Eastern equine encephalitis (EEE)

E. coli O157:H7

E. coli panel

Equine adenoviruses

Equine arteritis virus (EAV)

Equine herpesvirus
type 1

Equine herpesvirus
type 2

Equine herpesvirus
type 3

Equine herpesvirus
type 4

Equine herpesvirus
type 5

Equine infectious anemia (EIA)

Equine piroplasmosis

Equine protozoal myeloencephalitis (EPM)





Horsepox virus


Japanese encephalitis

Lawsonia intracellularis


Lyme disease


Neospora caninum

Neospora hughesi


Potomac horse fever


Rhodococcus equi


Sarcocystis neurona

St. Louis encephalitis

Strangles (Strep equi)

Streptococcus pneumoniae




Taylorella equigenitalis

Theileria equi

Toxoplasma gondii

Treponema pallidum


Trypanosoma equiperdum

Trypanosoma evansi

Venezuelan equine encephalitis (VEE)

Vesicular stomatitis

West Nile virus (WNV)

Western Equine Encephalitis (WEE)

Yersinia enterocolitica

Yersinia pseudotuberculosis

Genetic tests for...

Hyperkalemic periodic paralysis

St Louis encephalitis PCR test for horses
equine assay data sheet

St. Louis encephalitis

Test code:
S0057 - Ultrasensitive qualitative detection of St. Louis encephalitis virus by reverse transcription coupled real time polymerase chain reaction.


West Nile virus (WNV) and St. Louis encephalitis (SLE) virus are both arthropod-borne viruses within the Japanese encephalitis virus serocomplex (Murphy et al., 1995). They belong to the family Flaviviridae, genus Flavivirus. This group of viruses possesses a single positive strand of RNA genome of approximately 11 kb. Like West Nile virus and Japanese encephalitis virus, SLE is transmitted primarily through Culex species mosquitoes and birds. Humans, primates and other mammals are thought to be incidental hosts (Monath and Heinz, 1996).

Unlike WN, endemic SLE virus transmission in nature is silent, with no reports of avian mortality. Nevertheless, significant endemic spread of SLE in United States and in several South American countries has been reported. Over the past 70 years, SLE virus has been responsible for numerous epidemics throughout the United States; the largest occurred in 1975, with approximately 2,000 cases reported (Monath and Heinz, 1996).

Detection of this SLE virus by virus isolation followed by identification through immunofluorescence assays can take over a week to complete. Immunoglobulin M (IgM) capture and IgG enzyme-linked immunosorbent assays (ELISAs) are also used to detect this virus. However, confirmation of the infection can only be inferred by a fourfold or greater rise in virus-specific neutralizing antibody titers in either cerebrospinal fluid (CSF) or serum by performing the plaque reduction neutralization assay (PRNT) with several flaviviruses. Virus culture from CSF or serum has generally been unsuccessful due to the low level and short-lived viremia. PCR detection of this virus, thus, represents a rapid, specific and sensitive approach to detection of this virus.


  • Help confirm the disease causing agent
  • Help ensure that animal colonies are free of SLE virus
  • Early prevention of spread of the virus among animal populations
  • Minimize personnel exposure to the virus
  • Safety monitoring of biological products and vaccines that derive from animals

Monath, T.P. and Heinz, F.X. (1996) Flaviviruses, p. 978-984. In B.N. Fields (ed.), Fields virology, vol. 1, 3rd ed. Lippincott-Raven Publishers, Philadelphia, Pa.
Murphy, F.A., Fauquet, C.M., Bishop, D.H.L., Ghabrial, S.A., Jarvis, A.W., Martelli, G.P., Mayo, M.A. and Summers, M.D. (1995) Virus taxonomy, classification and nomenclature of viruses. Arch. Virol. 10 (Suppl): 1-586.

Specimen requirements: 0.2 ml whole blood in EDTA (purple top) or ACD (yellow top) tube, or 0.2 ml fresh or frozen CNS tissue, or 0.2 ml CSF, serum or plasma.

Contact Zoologix if advice is needed to determine an appropriate specimen type for a specific diagnostic application. For specimen types not listed here, please contact Zoologix to confirm specimen acceptability and shipping instructions.

For all specimen types, if there will be a delay in shipping, or during very warm weather, refrigerate specimens until shipped and ship with a cold pack unless more stringent shipping requirements are specified. Frozen specimens should be shipped so as to remain frozen in transit. See shipping instructions for more information.

Turnaround time: 2 business days

Methodology: Qualitative reverse transcription coupled real time PCR

Normal range: Nondetected

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