The nasal microbiota of dairy farmers is more complex than oral microbiota, reflects occupational exposure, and provides competition for staphylococci.

Of the 21 families, differences in abundance of 13 families (Corynebacteriaceae, Staphylococcaceae, Ruminococcaceae, Streptococcaceae, Streptococcaceae, Lachnospiraceae, Pseudomonadaceae, Sphingobacteriaceae, Bacteroidaceae, Pasteurellaceae, Dietziaceae, Veillonellaceae, and Xanthomonadaceae) in N_DF and O_DF were highly significant ( p -value <0 .0001).

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The higher relative abundance of Dolosigranulum in N_NF did not reach statistical significance in our study, but it could have an inverse relationship with S . aureus , as Dolosigranulum pigrum has been reported as a predictor for lack of S . aureus colonization in the nose [ 49 , 50 ].

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