Amongst the CA-CDI isolates, both NAP1 (9/40; 22.5%) and NAP 4 (8/40; 20%) were the most abundant, followed by NAP 2/11 (5/40; 12.5%), NAP 12 (4/40; 10%), and NAP 6 (4/40; 10.0%) (Table 3). This evidence concerns the gene NAP1L4 and clostridium difficile infection.