Retrospective analysis of the effects of Blastomyces antigen concentration in urine and radiographic findings on survivalin dogs with blastomycosis

1 de março de 2021

Analise retrospectiva dos efeitos da concentração de antígeno de Blastomyces na urina e achados radiográficos no prognóstico de cães com blastomicose.


Laura O. Motschenbacher, Eva Furrow, Aaron K. Rendahl, Esther G. Nell, Kari L. Anderson, Lindsay K. Merkel, Edward E. Patterson


Background: The Blastomyces antigen concentration in urine (BACU) test is used to diagnose blastomycosis and monitor treatment in dogs. It is unknown if a higher BACU is associated with shorter survival.

Objectives: To determine if the magnitude of BACU before treatment is associated with survival in dogs with blastomycosis. Animals: Fifty-two dogs with blastomycosis.

Methods: Retrospective case review. BACU, radiographic lung severity (RLS) score (0-4 scale), and survival time up to 1 year after diagnosis were obtained through medical record review of dogs with Blastomyces dermatitidis.

Results: The overall survival was: discharge, 87%; 1 week, 85%; 2 months, 74%; and 6 months, 69%. BACU correlated with RLS score (rs = 0.33, P = .02). BACU and RLS scores were lower in survivors to 2 months than nonsurvivors (average BACU difference of 2.5 ng/mL, 95% confidence interval [CI]: 0.2-4.8 ng/mL, P = .04; median RLS difference of 2; range, 0-4, P = .02). Dogs with BACU <5 ng/mL and dogs with mild (0-1) RLS scores had a greater proportion surviving than those with BACU >5 ng/mL (P = .03) and dogs with severe (3-4) RLS scores (P = .04). All dogs with a BACU <5 ng/mL or mild RLS score were alive at last follow-up (median, 365 days; range, 44-365 days). In all, 68.1% of other dogs survived to 2 months (95% CI, 54.8%-84.8%).

Conclusions and Clinical Importance: Dogs with lower BACU and RLS scores have improved survival; however, it is unclear what specific cutoffs should be used for prognosis.


Canine, prognosis, survival, systemic fungal infection

Palavras chave

Canino, prognóstico sobrevida, infecção fúngica sistêmica, micose sistêmica, fungo, Bastomicose, Cão

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