IL5 and hyperinsulinemic hypoglycemia, familial, 4: In contrast to IL‐4 deficiency, IL‐5 deficiency on the BALB/c background does increase adult survival,41 and a dramatic effect is seen in IL‐4Rα−/−/IL‐5 mice which harbour more worms and at least a hundred‐fold increase in blood mF.43, 44