Faecal shedding and serological cross-sectional study of Lawsonia intracellularis in horses in the state of Minas Gerais, Brazil.

The research article describes a study on the prevalence of a bacteria, Lawsonia intracellularis, in horses in the state of Minas Gerais, Brazil. The bacteria can cause an intestinal disease, proliferative enteropathy, in horses. The study found that both antibodies and bacteria shedding occurred in the horses, indicating the presence of the bacteria in this population.

About the Study

The study conducted a longitudinal investigation over a period of time to examine:

• The presence of Lawsonia intracellularis, a bacterium that causes proliferative enteropathy, in horses in Minas Gerais, Brazil.
• The detection methods involved serology and Polymerase Chain Reaction (PCR) techniques. Serology is the study of serum (a component of blood), in this case, looking for antibodies (IgG) that the animal’s immune system might have produced in response to the bacteria.
• The PCR technique helps identify the DNA of the bacterium in faecal samples, establishing if the horse is a faecal shedder of the bacterium, i.e., it is passing the bacterium in its faeces.

Results of the Study

The results of the serological and PCR tests were as follows:

• A total of 21 horse sera had significant immunoglobulin G titres or antibody levels (1:60) and were considered positive for the infection.
• The PCR test identified seven horses that were shedding L. intracellularis in their faeces.
• The infected horses appeared healthy, suggesting that they were carrying the bacteria subclinically, that is, without showing noticeable signs of disease.

Conclusions and Implications of the Study

The conclusions of the study can be summarized as:

• The presence of antibodies and evidence of faecal shedding suggest that L. intracellularis is present in the horse population in Minas Gerais, Brazil.
• The results serve as a warning for clinicians in countries where proliferative enteropathy has not been reported, to consider this disease when dealing with horses exhibiting enteric or intestinal disease symptoms.

In conclusion, it’s a significant study because it identifies a potential health issue in horses, even those that appear clinically healthy, and provides insight on the possible spread and detection of the disease.