[Recent information about the etiopathogenesis of paretic-paralytic forms of herpesvirus infection in horses].

The research article discusses a study on 21 horses showing clinical symptoms of EHV-infection, investigating the potential causes using serological and virological methods. The study found that EHV4 can cause the paralytic form of the infection and that a double infection of EHV4 and EHV1 is possible. The research also involved examining brain tissue and spinal fluid in 3 horses, which revealed hybridization with EHV4-DNA and less pronounced reaction with EHV1-DNA. Brain tissue and cerebrospinal fluid from two horses with paretic or paralytic disorders were also investigated.

Research Methods

• The study was carried out from the spring of 1990 to the summer of 1991 on 21 horses showing symptoms of EHV-infection.
• The researchers used serological and virological methods, including DNA-hybridization, to identify the causative agents of the infection.
• The brain tissue and/or spinal fluid from 3 out of the 21 horses were investigated using Dotblot hybridization with EHV1 and EHV4-DNA.
• Brain tissue and cerebrospinal fluid from two horses, showing paretic or paralytic disorders in 1979 and 1980, were also investigated using DNA hybridization.

Research Findings

• The results confirmed previous reports by the same researchers that EHV4 can also cause the paralytic form of the infection.
• It was found that a double infection with EHV4 and EHV1 cannot be ruled out.
• In the investigated samples from the three horses, hybridization with EHV4-DNA was found, with less pronounced reaction with EHV1-DNA. These results were confirmed by serological investigation.
• In one of the two horses showing paretic or paralytic disorders, the researchers detected EHV1-DNA in the cerebrospinal fluid. The other horse showed a strong reaction with EHV1 and a weaker reaction with EHV4 in its brain material. However, no hybridization was detected in the cerebrospinal fluid of the second horse.

Discussion of Results

• The findings of the study were discussed by the researchers, indicating the complexities involved in understanding the etiopathogenesis of paretic-paralytic forms of herpesvirus infection in horses.
• Further research is needed to fully understand the impact and implications of double infection with EHV4 and EHV1. This will be essential for timely diagnosis, treatment, and management of these illnesses in horses.