Changes

The most definitive method for diagnosis of EEE or WEE.  EEE virus can usually be isolated from the brains of horses, unless more than 5 days have elapsed between the appearance of clinical signs and the death of the horse. EEE virus can frequently be isolated from brain tissue even in the presence of a high serum antibody titre. WEE virus is rarely isolated from tissues of infected horses. Brain is the tissue of choice for virus isolation, but the virus has been isolated from other tissues, such as the liver and spleen. It is recommended that a complete set of these tissues be collected in duplicate, one set for virus isolation and the other set in formalin for histopathological examination. Specimens for virus isolation should be sent refrigerated if they can be received in the laboratory within 48 hours of collection; otherwise, they should be frozen and sent with dry ice.  Newborn mice, chicken embryos and a number of cell culture systems can be used for virus isolation

The most definitive method for diagnosis of EEE or WEE.  EEE virus can usually be isolated from the brains of horses, unless more than 5 days have elapsed between the appearance of clinical signs and the death of the horse. EEE virus can frequently be isolated from brain tissue even in the presence of a high serum antibody titre. WEE virus is rarely isolated from tissues of infected horses. Brain is the tissue of choice for virus isolation, but the virus has been isolated from other tissues, such as the liver and spleen. It is recommended that a complete set of these tissues be collected in duplicate, one set for virus isolation and the other set in formalin for histopathological examination. Specimens for virus isolation should be sent refrigerated if they can be received in the laboratory within 48 hours of collection; otherwise, they should be frozen and sent with dry ice.  Newborn mice, chicken embryos and a number of cell culture systems can be used for virus isolation

The virus is identified by complement fixation (CF), immunofluorescence, or plaque reduction neutralisation (PRN) tests. EEE and WEE viral RNA may also be detected by reverse-transcription polymerase chain reaction methods

The virus is identified by complement fixation (CF), immunofluorescence, or plaque reduction neutralisation (PRN) tests. EEE and WEE viral RNA may also be detected by reverse-transcription polymerase chain reaction methods.  Viral culture may also be useful for acute VEE.  Virus may be isolated from the CSF of acutely infected horses.  Virus may be found in brain tissue using fluorescent Ab, ELISA and virus isolation.

 

Viral culture may also be useful for acute VEE.  Virus may be isolated from the CSF of acutely infected horses.  Virus may be found in brain tissue using fluorescent Ab, ELISA and virus isolation.

   

   

     When the complement fixation (CF) test is used, EEE or WEE viruses can be identified in infected mouse or chicken brains, cell culture fluid, or amnionic-allantoic fluid. Virus can be identified in cell culture by direct immunofluorescent staining. The less commonly used method of virus identification is the neutralisation test, as outlined below.

     When the complement fixation (CF) test is used, EEE or WEE viruses can be identified in infected mouse or chicken brains, cell culture fluid, or amnionic-allantoic fluid. Virus can be identified in cell culture by direct immunofluorescent staining. The less commonly used method of virus identification is the neutralisation test.

   

   

     EEE virus nucleic acid in mosquitoes and tissues has been identified by the polymerase chain reaction (PCR) using primers selected from the capsid gene (15).  An alternate identification procedure is by hybridisation with an oligonucleotide probe. A reverse-transcription PCR method for detection of WEE RNA and alternative methods for EEE RNA detection have also been described (5, 7).

     EEE virus nucleic acid in mosquitoes and tissues has been identified by the polymerase chain reaction (PCR) using primers selected from the capsid gene (15).  An alternate identification procedure is by hybridisation with an oligonucleotide probe. A reverse-transcription PCR method for detection of WEE RNA and alternative methods for EEE RNA detection have also been described (5, 7).  Antigen-capture enzyme-linked immunosorbent assay (ELISA) has been developed for EEE surveillance in mosquitoes. This can be used in countries that do not have facilities for virus isolation or PCR (1).

   

    Antigen-capture enzyme-linked immunosorbent assay (ELISA) has been developed for EEE surveillance in mosquitoes. This can be used in countries that do not have facilities for virus isolation or PCR (1).

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