Actinobacillus suis infection of horses.

This research outlines a study that identified 19 instances of Actinobacillus suis infection in horses of varying ages, with most displaying severe health issues. The paper details the bacteriological characteristics of each case and their geographical distribution across New Zealand.

Subjects and Methodology

• The study observed horses from October 1978 to December 1980 and managed to isolate nineteen instances where horses were infected with Actinobacillus suis.
• The subjects varied in age from a full-term foetus to a 12-year-old horse, therefore covering a broad age spectrum.
• The collection of data was not limited to symptomatic instances; one isolate was obtained from a seemingly healthy horse, indicating the potential for carriers of the bacterium.

Results and Findings

• The majority of isolates were from horses displaying severe health complications; the researchers collected data from still-born foetuses, foals that died within their first week of life, and older horses with respiratory or genital infections.
• A single isolate was obtained from a horse with jaw abscesses, and another from a two-week-old foal suffering from diarrhoea.
• The researchers present a detailed account of the bacteriological characteristics of all isolates, providing an in-depth understanding of the pathology of Actinobacillus suis infection in horses.

Geographical Analysis

• The study also maps the geographical distribution of the infection, showing that Actinobacillus suis is widely dispersed throughout New Zealand.
• In the North Island’s northern region, the bacterium seems to be more prevalent than A. equuli, another bacterium known to infect equines. This indicates varying bacterial prevalence based on geographical regions, which may guide future research and prevention strategies.