4.6 Article

Microbiological Diagnoses on Clinical Mastitis-Comparison between Diagnoses Made in Veterinary Clinics versus in Laboratory Applying MALDI-TOF MS

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ANTIBIOTICS-BASEL
卷 11, 期 2, 页码 -

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MDPI
DOI: 10.3390/antibiotics11020271

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mastitis; MALDI-TOF MS; major pathogens; diagnostics; antibiotics

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This study compares the accuracy of diagnoses on bovine mastitis made by veterinary clinics using conventional methods with diagnoses made by a reference laboratory using MALDI-TOF MS as a diagnostic tool. The findings show that a significant number of diagnoses made by veterinary clinics are incorrect, resulting in the potential misuse of antibiotics.
The present study compares the diagnoses on clinical bovine mastitis made in veterinary clinics using conventional diagnostic methods with diagnoses on the same samples made by a veterinary reference laboratory using MALDI-TOF MS as diagnostics. The study enables targeted and evidence-based consulting on prudent mastitis diagnostics and related antibiotic usage. In total, 492 samples from clinical mastitis were included. When applying MALDI-TOF MS as gold standard, only 90 out of 492 diagnoses made in veterinary clinics, equal to 18%, were correct. Four main findings were important: (1) the veterinary clinics overlooked contamination in mastitis samples; (2) the veterinary clinics only assigned 2 fully correct diagnoses out of 119 samples with mixed growth cultures; (3) the veterinary clinics made close to half of their diagnoses on pure culture erroneously; (4) the veterinary clinics applied a limited number of the relevant pathogen identifications on pure culture samples. Altogether, the present study shows that a large part of Danish clinical mastitis cases are misdiagnosed. Lack of correct diagnoses and diagnostic quality control may lead to the choice of wrong treatment and thus hamper prudent use of antibiotics. Hence, the present study warns a risk of overuse of antibiotics in Denmark. Consequently, the present study calls for training of veterinary clinics in diagnostics of mastitis pathogens and national guidelines on quality assurance of mastitis diagnostics.

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