Streptococcus equi subsp. zooepidemicus finding in confirmed feline infectious peritonitis cat patient

Background: Feline infectious peritonitis (FIP) is a fatal immune-mediated disease in cat, caused by mutated feline
coronavirus (FCoV). Due to its difficulties in diagnosis, FIP is sometimes underdiagnosed. Therefore, several
laboratory procedures were performed to gain high index suspicion of FIP. However, through several laboratory
findings, not only FIP but also SEZ infection was confirmed in this case.

Case description: A-year-old male, domestic cat was admitted to Veterinary Medicine Clinical Pathology Laboratory, Universitas Gadjah Mada, for further effusion examination due to its high suspicion of feline infectious
peritonitis (FIP). Further examination using molecular and post-mortem analysis resulted on confirmed SEZ
infection and FIP. This study informed the manifestation and pathological changes in patient with SEZ and FIP in
the same time.

Conclusions: This study showed that viral infection followed by bacterial infection could be fatal and untreatable.
After these findings, clinicians may consider SEZ infection in cat with respiratory disorder followed by thoracic
effusion besides FIP. Companion animal, especially outdoor-kept animal, possibly become infected from its
contact to another human or animal in the environment.