[pazimzadeh]

The Th1 program in a T-helper cell suppresses the Th2 response, and vice versa. https://en.wikipedia.org/wiki/T_helper_cell#Th1/Th2_model

Although it's way more complicated than that and there are exceptions, but it's still a real phenomenon.

Community deworming increases Th1 cytokines https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5098677/

When you administer helminths to yourself there is no guarantee that they are going to the right spot in your body, etc. which explains why everyone responds differently.