The surface we are testing is seeded, i.e. brought into contact with, a liquid containing bacteria. The liquid is covered with a film to create an evenly distributed layer. This is then incubated for a day under ideal growth conditions for bacteria at 37 °C storage temperature and at least 90 per cent relative humidity. After 24 hours, the counting procedure is begun to see how many of the original number of about 100,000 germs have survived this test.
On an untreated sample there are about a million germs after a 24-hour incubation period. On a treated sample, we ideally only find a fraction of the germs that were put there. In the case of the Leica DM500 und DM750 with the AgTreatTM coating, we found that germs had been reduced by between 90 and 99.9 per cent.