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Open AccessArticle

Efficacy of Bacteriophages Against Staphylococcus aureus Isolates from Bovine Mastitis

1
Department of Bioprocess Engineering and Microbiology, University of Applied Sciences and Arts Hannover, D-30453 Hannover, Germany
2
Phage Technology Center GmbH, D-59199 Bönen, Germany
3
Section for Production, Nutrition and Health, Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, DK-1870 Frederiksberg C, Denmark
*
Author to whom correspondence should be addressed.
Pharmaceuticals 2020, 13(3), 35; https://doi.org/10.3390/ph13030035
Received: 24 November 2019 / Revised: 5 February 2020 / Accepted: 24 February 2020 / Published: 26 February 2020
(This article belongs to the Special Issue Phage Therapy and Phage-Mediated Biological Control)
The lytic efficacy of bacteriophages against Staphylococcus aureus isolates from bovine milk was investigated in vitro, regarding possible applications in the therapy of udder inflammation caused by bacterial infections (mastitis). The host range of sequenced, lytic bacteriophages was determined against a collection of 92 Staphylococcus (S.) aureus isolates. The isolates originated from quarter foremilk samples of clinical and subclinical mastitis cases. A spot test and a subsequent plaque assay were used to determine the phage host range. According to their host range, propagation and storage properties, three phages, STA1.ST29, EB1.ST11, and EB1.ST27, were selected for preparing a bacteriophage mixture (1:1:1), which was examined for its lytic activity against S. aureus in pasteurized and raw milk. It was found that almost two thirds of the isolates could be lysed by at least one of the tested phages. The bacteriophage mixture was able to reduce the S. aureus germ density in pasteurized milk and its reduction ability was maintained in raw milk, with only a moderate decrease compared to the results in pasteurized milk. The significant reduction ability of the phage mixture in raw milk promotes further in vivo investigation. View Full-Text
Keywords: bacteriophage mixture; phage therapy; lytic phage; dairy; bovine mastitis bacteriophage mixture; phage therapy; lytic phage; dairy; bovine mastitis
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Titze, I.; Lehnherr, T.; Lehnherr, H.; Krömker, V. Efficacy of Bacteriophages Against Staphylococcus aureus Isolates from Bovine Mastitis. Pharmaceuticals 2020, 13, 35.

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