Figure 6

The average concentration of TNF-α. TNF-α (ng/mL) was determined in quarter milk before and after experimental intramammary challenge with Staphylococcus fleurettii, S. chromogenes TA (teat apex strain), S. chromogenes IM (intramammary strain) and phosphate-buffered saline (control). The error bars represent the standard error of the mean (+SEM). TNF-α was not detected in the control quarters.