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Summary
A study found that 37.8% of Detroit stray dogs had leptospirosis antibodies, with 2-mercaptoethanol aiding diagnosis. Canine urine pH adjustment improved leptospire isolation, identifying Leptospira icterohaemorrhagiae as the most common type.
Area of Science:
- Veterinary Medicine
- Infectious Diseases
- Microbiology
Background:
- Leptospirosis is a significant zoonotic disease affecting dogs worldwide.
- Accurate diagnosis and isolation of Leptospira are crucial for disease control.
- Environmental factors, such as urine pH, can influence Leptospira survival and detection.
Purpose of the Study:
- To determine the prevalence of leptospiral agglutinins in stray dogs in Detroit, Michigan.
- To evaluate the utility of 2-mercaptoethanol in differentiating acute and chronic leptospirosis.
- To optimize cultural isolation of Leptospira from canine urine.
Main Methods:
- Serological testing for leptospiral agglutinins in 433 urban and 123 suburban stray dogs.
- Application of 2-mercaptoethanol to distinguish acute from chronic serum titers and clarify cross-reactions.
- Attempted cultural isolation of Leptospira from urine samples, with pH manipulation using sodium bicarbonate.
Main Results:
- Significant leptospiral titers were found in 37.8% of urban and 18.7% of suburban stray dogs.
- 2-mercaptoethanol effectively differentiated acute from chronic titers and resolved cross-reactivity.
- Leptospira isolation was successful from urine with pH 6.6-8.0; alkalinization of acidic urine facilitated isolation.
- Leptospira icterohaemorrhagiae was the predominant serotype identified serologically and the only one cultured.
Conclusions:
- Leptospirosis is prevalent in the Detroit stray dog population.
- 2-mercaptoethanol is a valuable tool for leptospirosis serodiagnosis in dogs.
- Modifying canine urine pH is essential for successful Leptospira culture, aiding in pathogen identification and epidemiological studies.