Fig. 4

Sterility testing. Above: The content of all tubes was clear and no turbidity was seen after 14 days of incubation. Below: Magnifications of the tubes inoculated with content of dispenser 1 showing no turbidity after incubation for 14 days as described in material and methods (from left to right: Tryptone Soya Broth and peanut (*), Tryptone Soya Broth and placebo and only Tryptone Soya Broth (white arrow); Nutrient broth and peanut (*), Nutrient broth and placebo, only Nutrient broth (black arrow))