Fig. 2

Comparison of strain groups (origin) based on salinity. Boxplot: centre: median, box limits: 25th and 75th centiles, whiskers extend to the smallest/largest value no further than median ± 1.5 times interquartile range (IQR). (C – clinical, S – salmon, CC – cold cuts, FF – frozen food); a,b—values marked with different letters differ in a statistically significant way