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The inhibition of coagulase-negative staphylococci and Staphylococcus aureus of human or animal origin by most free fatty acids was similar, but coagulase-positive staphylococci were sensitive and coagulase-negative cultures were resistant to linolenic acid. Animal strains of S. aureus were more sensitive to linolenic acid than were human strains. These differences were reflected in the relative abilities of the three categories of strains to survive on human skin. The antibacterial effects of 20 mg of linolenic acid were inactivated by 1 ml of serum in vitro. A test organism seeded on to skin also survived better if first suspended in serum. The mechanism of the interaction between serum and linolenic acid may be due to a detergent effect of the serum and could account for colonisation of diseased skin with S. aureus. Cultures of S. aureus seeded on to human skin were rapidly killed after the skin has been covered with linolenic acid. The possibility of therapeutic use of linolenic acid as an antibacterial agent should be explored.

Sensitivity of staphylococci to fatty acids: novel inactivation of linolenic acid by serum