Possible Clues:

• Absence of germs
• Germ-free state
• Uncontained cases rise around essentially lapsed sterile state
• A month before relative got freedom from infection
• With such passes I get nothing bad
• When sister keeps record showing lack of infection?
• I passes this so that I can pass an island
• That'll make sure there's nothing the matter with it
• There's nothing the matter with this
• That ought to make sure there's nothing the matter