Possible Clues:

• This will stop one from going to the bad
• Sterile state
• Umbrian town briefly holding record for freedom from germs
• Australian snake exists in poison-free state
• Absence of viruses and other microorganisms
• Freedom from germs
• Fool is preserving record in sterile condition
• Absence of pathogenic micro-organisms
• Being germ-free, is almost passed for work
• Purity of peas cultivated by relative