Associations between physical examination, laboratory, and radiographic findings and outcome and subsequent racing performance of foals with Rhodococcus equi infection: 115 cases (1984-1992)

Dorothy M. Ainsworth From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Steven W. Eicker From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Amy E. Yeagar From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Corinne R. Sweeney From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Laurent Viel From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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David Tesarowski From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Jean-Pierre Lavoie From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Andrew Hoffman From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Mary Rose Paradis From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Steven M. Reed From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Hollis N. Erb From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Elizabeth Davidow From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Megan Nalevanko From the Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401 (Ainsworth, Eicker, Yeagar, Erb, Davidow, Nalevanko); Department of Clinical Studies (New Bolton Center), School of Veterinary Medicine, University of Pennsylvania, Kennett Square, PA 19348 (Sweeney); Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada NIG 2W1 (Viel, Tesarowski); Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montreal, Saint Hyacinthe, Quebec, Canada J2S 7C6 (Lavoie); Department of Medicine, School of Veterinary Medicine, Tufts University, North Grafton, MA 01536 (Hoffman, Paradis); and Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210 (Reed).

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Objective

To determine whether physical examination, laboratory, or radiographic abnormalities in foals with Rhodococcus equi infection were associated with survival, ability to race at least once after recovery, or, for foals that survived and went on to race, subsequent racing performance.

Design

Retrospective study.

Animals

49 Thoroughbreds and 66 Standardbreds admitted to 1 of 6 veterinary teaching hospitals between 1984 and 1992 in which R equi infection was positively diagnosed.

Procedure

Results of physical examination, laboratory testing, and thoracic radiography were reviewed. Indices of racing performance were obtained for foals that recovered and eventually raced and compared with values for the US racing population.

Results

83 (72%) foals survived. Foals that did not survive were more likely to have extreme tachycardia (heart rate > 100 beats/min), be in respiratory distress, and have severe radiographic abnormalities on thoracic radiographs at the time of initial examination than were foals that survived. Clinicopathologic abnormalities were not associated with whether foals did or did not survive. Forty-five of the 83 surviving foals (54%) eventually raced at least once, but none of the factors examined was associated with whether foals went on to race. Racing performance of foals that raced as adults was not significantly different from that of the US racing population.

Clinical Implications

R equi infection in foals is associated with a decreased chance of racing as an adult; however, foals that eventually go on to race perform comparably to the US racing population. (J Am Vet Med Assoc 1998;213:510-515)

Objective

To determine whether physical examination, laboratory, or radiographic abnormalities in foals with Rhodococcus equi infection were associated with survival, ability to race at least once after recovery, or, for foals that survived and went on to race, subsequent racing performance.

Design

Retrospective study.

Animals

49 Thoroughbreds and 66 Standardbreds admitted to 1 of 6 veterinary teaching hospitals between 1984 and 1992 in which R equi infection was positively diagnosed.

Procedure

Results of physical examination, laboratory testing, and thoracic radiography were reviewed. Indices of racing performance were obtained for foals that recovered and eventually raced and compared with values for the US racing population.

Results

83 (72%) foals survived. Foals that did not survive were more likely to have extreme tachycardia (heart rate > 100 beats/min), be in respiratory distress, and have severe radiographic abnormalities on thoracic radiographs at the time of initial examination than were foals that survived. Clinicopathologic abnormalities were not associated with whether foals did or did not survive. Forty-five of the 83 surviving foals (54%) eventually raced at least once, but none of the factors examined was associated with whether foals went on to race. Racing performance of foals that raced as adults was not significantly different from that of the US racing population.

Clinical Implications

R equi infection in foals is associated with a decreased chance of racing as an adult; however, foals that eventually go on to race perform comparably to the US racing population. (J Am Vet Med Assoc 1998;213:510-515)

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