Tapeworms and Brexit. These nasty gut-wrenching wretches take all the nutrition out of the intake of the hosts, leaving their landlords pale, immunologically compromised and sapped of nutrition.
Easy to get rid of but difficult to countenance for the afflicted.
How did that happen to me?
Worms. Often absorbed through contamination by or ingestion of meat products unless cooked properly; trotters, minced pork meat, knuckle or gammon.
Otherwise through excrement. Handled by humans, transmitted by flies and shoes alike. Brexit.