In early work looking solely at infection burden it was observed that when Heligmosomoides bakeri (Hb, formerly H. polygyrus and Nematospiroides dubius) was co‐infected in models of resistance to Trichuris muris (Tm) or Trichinella spiralis, expulsion of these parasites was dramatically impaired.10, 11. This evidence concerns the gene GSTM1 and infection.