Respiratory Infection in Equine Encephalomyelitis.

The research explores the transmission of Equine Encephalomyelitis to horses through the inhalation of a specific virus. This virus was derived from the brain of an infected horse during the 1931 epidemic in Western Nevada, and has been maintained through guinea pigs and horses for 18 months.

Methods and Materials

The researchers in this study utilized a strain of the virus originating from a horse brain belonging to a horse that fell ill during the Equine Encephalomyelitis outbreak in 1931.

• This strain has been kept alive and passed through guinea pigs and horses for a year and a half.
• The virus for the experiment was prepared using a one percent emulsion of Locke’s solution with the brain and liver virus taken from three guinea pigs.
• The mixture was left to extract at a temperature of 5° C. for three hours, with occasional agitation.
• Following this, the extraction was centrifuged and filtered using Berkefeld N filters, a procedure to remove impurities and obtain a clean sample of the virus. The pooled filtrates were collected after the process

Procedure

The filtrates were tested to ensure that no bacterial growth that could interfere with the results was present. The verification was carried out in aerobic and anaerobic conditions and was observed for ten days.

• The pH of the pooled filtrate was determined to be 7.2.
• After preparation and testing, 50 cubic centimeters of the virus was instilled into one nostril of a horse. The result of the infection and transmission were studied thereafter.

The research aimed to understand the extent and method of transmission of Equine Encephalomyelitis, potentially leading to better treatments or preventative measures.