Diseases in free-ranging bats from Germany.

Area of Science:

• Veterinary Pathology
• Wildlife Disease Ecology
• Microbiology

Background:

• Bats are recognized as potential reservoirs for viral diseases, prompting interest in their role in zoonotic disease transmission.
• Limited research exists on pathogens affecting bats and their impact on bat mortality, with few studies combining pathological and microbiological investigations.
• Previous studies often faced limitations due to small sample sizes in examining free-ranging bats.

Purpose of the Study:

• To investigate the causes of mortality in free-ranging bats through comprehensive post-mortem examinations.
• To identify pathogens and pathological conditions affecting European bat populations.
• To assess the potential health risks posed by bats to humans.

Main Methods:

• Post-mortem examinations were conducted on approximately 500 deceased bats from 19 European species (family Vespertilionidae).
• Histo-pathological and bacteriological investigations were performed on bat carcasses collected across Germany.
• Comparative analysis correlated histo-pathology and bacteriology findings to identify disease-associated bacteria.

Main Results:

• Inflammatory lesions were detected in over half of the bats examined, with the lungs being the most commonly affected organ (40%).
• Twenty-two bacterial species were identified and linked to pathological lesions.
• Traumatic injuries, particularly cat attacks, were a significant cause of mortality, alongside disease-related deaths.

Conclusions:

• Free-ranging bats are susceptible to various infectious diseases, acting as reservoirs for microbial agents, some with zoonotic potential.
• The study found no evidence suggesting European bats pose a higher health hazard to humans compared to other wildlife.
• Pathological and microbiological investigations are crucial for understanding bat health and their role in disease ecology.