IL2 and Nematoda infectious disease: The increased IL-2 transcription in lymph nodes, which apparently seems to contrast with the results observed at the gastric mucosal level, could be related to the development of mixed Th1/Th2 observed by some authors in gastric nematode infections in ruminants after previous sensitization [41,48], or in cattle and sheep vaccinated against O. ostertagi and T. circumcincta, respectively [49,50].