Possible Clues:

• Rod-shaped bacteria
• Graduate with cold in a bad way -- I could get germs!
• Graduate with cold, under the weather -- one could get germs
• Germs in second-rate air-conditioning bringing misfortune to island
• Bugs from sick one taking a taxi back
• Germs could become biological without processed goo
• B-Bill having ailment, one on account of these?
• Coming back by cab it's sick they make one
• Bugs Bunny's first flier, one badly set up
• One bill inside another, I conclude, may cause ill feeling