FeverFever of Unknown OriginNeutropeniaEquine Infectious AnemiaInfectious Anemia Virus, EquineCeftazidimeBacterial InfectionsAmikacinAgranulocytosisPiperacillinInfectionThienamycinsBacteremiaHorsesProspective StudiesNeoplasmsDrug Therapy, CombinationHematologic NeoplasmsAnti-Bacterial AgentsSepsisEpisode of CareTreatment OutcomeAntineoplastic Combined Chemotherapy ProtocolsRecurrenceTime FactorsPeritonitisRetrospective StudiesFollow-Up StudiesAcute DiseaseMELAS Syndrome