The possible role of infection through the valved sideport of Venflon cannulae was evaluated by one individual who followed an identical procedure of placing a syringe into the sideport and injecting saline solution. Basic aseptic techniques were used in a contaminated, busy environment. No bacterial growth was found in either anaerobic or aerobic culture media following a total of 1500 injections. The experiment shows that if the measures used could be applied, infection through the sideport would be minimal.