Here is a helpful paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4744952/

Currently on mobile so I'm going to do a really poor job of summarizing it, but essentially:

1. Mucus membranes help to keep parasites from attaching.

2. Innate immunity - Macrophages gobble up larvae. Circulating granulocytes (cells that carry toxic granules, think of them as bombers) and pro-inflammatory cytokine molecules make life generally unpleasant.

3. Adaptive Immunity - The big player is a class of antibody called IgE that is meant to be anti-parasite. Coordination between Helper T's, Killer T's l, IgA/IgE, etc. results in a cascade of events including: increased mucus production, attracting more granulocytes for carpet bombing, flagging parasitic cells for death (i.e. by Killer T's), reinvigorates macrophages to fight harder, etc.

Again this is a really rough summary, if you want to dive deeper I suggest checking out the paper and some of its sources! Hope this helps.