Fig. 1From: Characterization of the upper and lower respiratory tract microbiota in Piedmontese calvesAverage relative abundance of phyla in the nasal swab (NS) and trans-tracheal aspiration (TTA) samples. Only phyla with a relative abundance higher than 1% in at least one sample type were represented. Blue columns represent NS (n = 11) samples, while red columns represent TTA (n = 17). The bars represent the standard error of the meanBack to article page