I looked up paragonimiasis. That sure looks like the sickness he had. Dr. Google says it requires treatment asap. His went in for months, misdiagnosed and mistreated. No wonder his recovery was extended.
If I recall correctly, +Bp. Tissier wrote in his biography of Archbishop LeFebvre that he picked up some sort of parasitic infestation in Gabon, that remained latent for a lengthy period of time, but eventually landed him in a French hospital for IV treatments. I’m thinking it was liver flukes. At any rate, he made a full recovery.