Łazowski spent time in a prisoner-of-war camp prior to his arrival in the town, where he reunited with his family and began practicing medicine with his medical-school friend Dr Stanisław Matulewicz. Using a medical discovery by Matulewicz, that healthy people could be injected with a strain of Proteus that would make them test positive for typhus without experiencing the disease, Łazowski created a fake outbreak of epidemic typhus in and around the town of Rozwadów (now a district of Stalowa Wola), which the Germans then quarantined. This saved an estimated 8,000 people from being sent to German concentration camps during the Holocaust.[1]