Among the top 25 upregulated DEGs (of 76), ranked by fold‐increase from pathogen‐only to co‐colonisation, nearly half have roles in or correlate to infection (clec‐232, cld‐1, F08H9.4, irg‐4, cnc‐6 and ftn‐1), stress (numr‐1, numr‐2, ZC21.10 and hsp‐12.6), or otherwise appear to be at least partially regulated by key stress/immune response signalling pathways (dct‐8 and dod‐21) (Figure 5, Table S3). The gene discussed is CLDN1; the disease is infection.