what does it mean to be covered in goa'uld
Film directors love their mind-controlling parasites. Stargate SG-1 provides a particularly icky example: the Goa'uld Symbiote, a snake-like creature that penetrates its host's neck and wraps itself around the spine, taking over control.
Goa'uld are evil, arrogant creatures with a plan for galactic domination. Real-life parasites don't share those goals (as far as we know…) but many are capable of mind control. One creepy example, Ophiocordyceps unilateralis, is a fungus that attacks ants. Once it invades an ant, the fungus compels the poor insect to scramble down to low leaves, finally biting a vein on the underside of a perfectly placed leaf. Having done its job, the "zombie" ant then dies. To make matters worse, its body becomes a greenhouse for the fungus, forming a protective shell where the organism can grow until it bursts a spore-bearing stalk through the unfortunate insect's head. [Gallery: Zombie Ants]
https://www.livescience.com/20624-5-alien-parasites-real-inspiration.html