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Histoplasma capsulatum in Bat Species in Portugal
Jaqueline T Bento1, Ana Cláudia Coelho2,3,4, Hugo Rebelo5,6
1School of Medicine and Biomedical Sciences (ICBAS), University of Porto, 4050-313 Porto, Portugal.
Abstract:
Histoplasmosis, caused by the fungus Histoplasma capsulatum, poses health risks to various mammals, including humans. Bats are primary wild carriers of Histoplasma capsulatum, playing a crucial role in its epidemiology. However, fecal shedding in Europe remains poorly studied, with no data available for Portugal. This study analyzed 285 guano samples from 22 bat species, collected across Portuguese regions between 2014 and 2018, using a nested PCR assay. Despite using a sensitive method, no positive samples were detected. These results align with other European studies, suggesting that Histoplasma capsulatum circulates at low levels in European bat populations. However, they contrast with findings from regions like Brazil and Mexico, where the fungus is more prevalent due to differing geographic, climatic, and ecological factors. The absence of Histoplasma capsulatum in Portuguese bat guano highlights the importance of local environmental conditions and raises questions about its distribution in Europe. Although bats can harbor zoonotic pathogens, our findings suggest they do not shed Histoplasma capsulatum in Portugal. Continuous monitoring and research are essential in understanding infectious disease dynamics. Targeted surveillance in caves could improve early detection and management strategies for potential histoplasmosis outbreaks, contributing to public health efforts in these ecosystems.
Insights
No Histoplasma capsulatum was detected in Portuguese bat guano, indicating low circulation in European bats. This study highlights the importance of local environmental factors in fungal epidemiology and public health.
Area of Science:
- Veterinary Mycology
- Zoonotic Disease Epidemiology
- Environmental Microbiology
Background:
- Histoplasmosis, caused by Histoplasma capsulatum, affects mammals, with bats as key wildlife reservoirs.
- Limited data exists on Histoplasma capsulatum fecal shedding in European bats, particularly in Portugal.
- Understanding fungal epidemiology in bats is crucial for public health and disease management.
Purpose of the Study:
- To investigate the presence of Histoplasma capsulatum in bat guano from Portugal.
- To assess the role of Portuguese bat populations in the epidemiology of histoplasmosis.
- To contribute data on the geographic distribution of Histoplasma capsulatum in Europe.
Main Methods:
- Analysis of 285 bat guano samples from 22 species across Portugal (2014-2018).
- Utilized a sensitive nested PCR assay for pathogen detection.
- Employed rigorous sample collection and laboratory analysis protocols.
Main Results:
- Histoplasma capsulatum was not detected in any of the analyzed Portuguese bat guano samples.
- These findings align with low-level circulation observed in other European bat populations.
- Contrast with higher prevalence in regions like Brazil and Mexico due to environmental differences.
Conclusions:
- Portuguese bats do not appear to shed Histoplasma capsulatum, suggesting limited local prevalence.
- Environmental and ecological factors significantly influence fungal distribution and shedding.
- Further surveillance in bat habitats is recommended for early detection and public health protection.
