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Background  Hypovitaminosis D is a risk factor for the development of respiratory infections in humans and repletion can be protective.    Objectives  Determine if serum 25‐hydroxyvitamin (OH)D concentrations are lower in shelter dogs and if 25(OH)D concentrations are associated with clinical signs of canine infectious respiratory disease complex (CIRDC) or with time in the shelter.    Animals  One hundred forty‐six shelter dogs (clinically ill n = 36, apparently healthy n = 110) and 23 nonshelter control dogs.    Methods  Prospective cohort study. Shelter dogs were grouped as clinically ill or apparently healthy based on the presence or absence, respectively, of clinical signs associated with CIRDC. Serum 25(OH)D concentrations were measured with a competitive chemiluminesence immunoassay. Nucleic acids of agents associated with the CIRDC were amplified by polymerase chain reaction assays.    Results  The concentration of 25(OH)D was 7.3 ng/mL (4.5‐9.9, 95% confidence interval [CI]) lower in dogs with signs of CIRDC than apparently healthy shelter dogs ( t (142) = 2.0,  P  = .04). Dogs positive for DNA of canine herpesvirus (CHV)‐1 had serum 25(OH)D concentrations 14.9 ng/mL (−3.7 to 29.6, 95% CI) lower than dogs that were negative ( t (137) = 2.0,  P  = .04). Serum 25(OH)D concentrations in shelter dogs were not different from control dogs ( t (45) = −1.4,  P  = .17). Serum 25(OH)D concentration was not associated with duration of time in the shelter ( F (1, 140) = 1.7,  P  = .2,  R  2  = 0.01).    Conclusion and Clinical Importance  Vitamin D could have a role in acute respiratory tract infections in shelter dogs.

Serum 25‐hydroxyvitamin D concentration and infectious respiratory disease complex in shelter dogs