Today, we’ll be following an anaphylactic reaction to an allergen.  

Disclaimer: I’m not a doctor – just a bioengineer who happens to find pathophysiology fascinating.  If you find an error, please let me know!  Als0, NONE of my drawings are to scale.

An allergy starts out very innocently.  Everything is humming along: white blood cells patrolling the blood stream, stomach merrily digesting shellfish, or medicine destroying bacteria.

Meet Jill.

Hello!

Hello!

Jill’s taking a particular antibiotic for the first time, and it’s working great: fighting bacteria just like it’s supposed to.

Unfortunately, her white blood cells are getting curious.