Soon after, the observation with smallpox led Pirquet to realize that tuberculin, which Robert Koch isolated from the bacteria that cause tuberculosis in 1890, might lead to a similar type of reaction.
Pian isorokkohavainnon jälkeen Pirquet ymmärsi, että tuberkuliini, jonka Robert Koch oli 1890 eristänyt tuberkuloosia aiheuttavasta bakteerista, voi saada aikaan samanlaisen reaktion.