How can parasites live in a fully cooked crisp piece of bacon?

I'm pretty sure that it can't. I believe that you are referring to trichinosis, a disease caused by parasitic worm larvae found in the muscle of pigs and wild game. read more

A fully cooked and crispy piece of bacon will have been heated to a temperature high enough to kill the parasite. Honestly, trichinosis isn't the health hazard that it was perceived to have been years ago. The pigs get the worms from rooting in the ground. read more

Eating uncooked bacon can expose you to bacteria as well as parasites and can cause either bacterial infections or trichinellosis, also called trichinosis, a parasitic infection. Bacterial infections and trichinellosis can both cause gastrointestinal symptoms. read more

Fully cooking pork is the only way to ensure all parasites contained within the meat are destroyed. Always use a food thermometer to measure the temperature of cooked meat. Insert the thermometer into the meat while it remains on the cooking heat source, and never taste meat before it has been fully cooked. read more