An Occurrence of Equine Transport Pneumonia caused by Mixed Infection with Pasteurella caballi, Streptococcus suis and Streptococcus zooepidemicus

A PCR-RFLP Analysis of the Szp Gene in Streptococcus zooepidemicus Isolates from Mares with Metritis in Japan

“…zooepidemicus) is a commensal bacterium of the pharyngeal tonsils and nasopharyngeal mucosa of horses [1,2]. However, opportunistic infections by this organism of the respiratory, intestinal and reproductive tracts have been reported [1][2][3]6]. This bacterium can be a causative agent of purulent rhinitis, bronchitis or pne umonia in horses under stress caused by transportation or virus infections.…”

Cytological and Bacteriological Observation of Tracheal Aspirates and Bronchoalveolar Lavage Fluid Obtained from Thoroughbred Racehorses with Pneumonia Associated with Transport

“…The former bacterial group tended to be more sensitive to cephalotine and gentamicin than the later bacterial group. S. zooepidemicus has been described as the bacterium isolated most frequently in respiratory diseases of horses [1,4,12,15]. In this study, S. zooepidemicus was also isolated at the highest percentage (39.5%) from BALF taken from racehorses with pneumonia associated with transport.…”

Pneumonia in Horses Induced by Intrapulmonary Inoculation of Streptococcus equi subsp. zooepidemicus

“…Horses were then infected with S.z via the respiratory tract, and pneumonia was observed over time. Important histological findings are summarized in the following points: (a) Welldefined pneumonia starts at 3 hr after inoculation, but ini- ESFP is characterized by hemorrhagic, purulent, pleuritic pneumonia and the purulent pneumonia accompanied by pleuritis [6,11,18]. In a loading test based on the S.z infection, in which horses were transported for long hours, they developed a serous, hemorrhagic bronchial pneumonia of a highly purulent nature and multiple, coagulation necrotic pneumonia [14].…”

“…In recent years, there have been reports that Streptococcus equi subsp. zooepidemicus (S.z) was frequently isolated as the predominant organism from the pulmonary foci of horses suffering from ESFP and S.z may play a key role in the pathogenesis of ESFP [6,12,14]. As S.z is a common commensal organism in the equine tonsil and nasopharynx and is not an airborne organism [9,14,23].…”