This is what I'm suggesting could be an alternate explanation for Bart improvement after taking these anti parasitics:
"Chronic helminthic infections induce predominantly Th2-type immune responses . However, protective immunity against intracellular pathogens, including mycobacteria, require Th1 responses . As Th1/Th2 responses are mutually exclusive, and helminths by capitalizing on the Th2 response may cross-inhibit Th1 response required to clear mycobacteria  it has been suggested that the removal of intestinal helminths by deworming would remove the inhibitory effects of Th2 on Th1 responses [20,32]."
Effect of deworming on human T cell responses to mycobacterial antigens in helminth-exposed individuals before and after bacille Calmette–Guérin (BCG) vaccinationhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmc1905995/