Published online by Cambridge University Press: 20 October 2005
Towards the end of the 19th century there was a need for standardized tests to determine the efficiency of disinfectants against the newly discovered bacterial pathogens. Methods had been developed in which disinfectants were tested on organisms soaked into thread or coated onto garnets. However, more appropriate were tests based on contact between dilutions of disinfectant and suspensions of organisms, which could be subcultured to detect residual infectivity.