Things living inside people...

Don't click if you've just eaten:

"I have just got over what started out as a severe flu-like viral infection, feeling cold, sweating, aching all over, head-ache, nausea, loss of appetite and as that subsided the worst cough of all. Initially an irritating dry tickle at the back of my throat but as the days progressed it developed into a full on chesty cough bringing up copious quantities of vile, pus-like, foul-tasting, yellow-green phlegm. Several visits to the doctor and courses of antibiotics failed to clear me of the affliction but eventually the cause of my illness was discovered.... I had a lung-worm!"

I feel queasy.