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Four serum-sensitive strains ofEscherichia coli were exposed to 10, 20, and 50% fresh, heat-inactivated, and fresh human serum to which had been added Liquoid at a final concentration of 0.05, 0.025, 0.0125 and 0.006%. It was found that 50% fresh serum (in nutrient, Mueller-Hinton, thioglycolate, or Trypticase Soy Broth) killed more than 104 organisms/ml within 3 min, whereas 20 and 10% fresh serum required up to 20 and 40 min, respectively, to kill a comparable number of organisms. To neutralize the activity of 50% fresh serum, 0.0125% Liquoid had to be added, whereas an 0.006% final concentration of Liquoid was sufficient to antagonize the activity of 10 and 20% serum. However, when exposing extremely small bacterial inocula to fresh serum, at least 0.025% Liquoid was necessary to abolish the serum-bactericidal activity of 20 and 50% fresh serum. Liquoid had to be added to 50% fresh serum within seconds to prevent the killing of the majority of test organisms derived from small inocula. It is recommended that blood samples drawn from septicemic or bacteremic patients be aseptically added to a suitable broth which contains at least 0.025% Liquoid in order to improve the chances of isolating pathogens present in small numbers.

Inactivation of the Bactericidal Activity of Human Serum by Liquoid (Sodium Polyanetholsulfonate