He accurately diluted a suspension of these viruses and discovered that the highest dilutions (lowest virus concentrations), rather than killing all the bacteria, formed discrete areas of dead organisms.
Diluíu con precisión unha suspensión deses virus e descubriu que canto maior era a dilución (é dicir, menor era a concentración viral), en vez de mataren todas as bacterias os virus producían áreas discretas de bacterias mortas.