Unusual Mortality Event in Egyptian Fruit Bat Population in Northern Cyprus
A case report documents an unprecedented surge in mortality among Egyptian fruit bats in northern Cyprus from January to June 2025, with Staphylococcus aureus bacteria identified in multiple individuals. Concurrent roost surveys in early 2026 revealed marked population declines at multiple historical sites, though the bacteria alone may not explain the broader population-level losses. The findings are significant because the Cyprus population is genetically isolated and of conservation concern, prompting calls for urgent monitoring and expanded pathogen surveillance.
Researchers from the Cyprus Wildlife Research Institute reported an unusual mortality event affecting the isolated Egyptian fruit bat population in northern Cyprus. Between January and June 2025, the institute's wildlife hospital received 12 bat admissions—unprecedented compared to sporadic admissions in prior years—with most individuals arriving moribund and dying within 12-24 hours. Clinical examination revealed localized purulent lesions and abscesses in multiple cases, from which Staphylococcus aureus was cultured and identified via PCR assays; isolates showed susceptibility to tested antibiotics. Concurrent targeted surveys of ten known roosts in February-March 2026 documented marked declines, including reductions from hundreds to single-digit counts at formerly large colonies and complete absence at multiple roosts. While S. aureus infections are seasonally concentrated in winter and consistent with observed lesions, the authors note that causality for population-level declines remains unknown, and other factors such as toxins, unassessed pathogens, or multi-factor stressors cannot be excluded. The researchers recommend urgent longitudinal population monitoring, expanded pathogen surveillance including whole-genome sequencing, toxicological screening, and development of a species recovery plan.
What's missing
The study's own limitations include: causality between S. aureus infection and population-level declines remains unestablished; other potential pathogens were not comprehensively assessed; toxicological screening was not performed; the temporal gap between the mortality surge (Jan-Jun 2025) and roost surveys (Feb-Mar 2026) leaves the immediate cause of population declines unclear; and the relative contribution of S. aureus versus other stressors cannot be quantified from the data presented.
What different sources said
- bioRxivCenter
Case report of unusual mortality of Egyptian fruit bat (Rousettus aegyptiacus) in northern Cyprus
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