Possible Clues:

• Finish mice off in local
• Type of disease that might cause death to experimental mice
• Prevalent in a district
• The present way to kill mice by chopping them in bits?
• Conclusion: mice sadly may well be ineradicable
• About half enclosed, restricted to a particular area
• Finish with half of them in charge, within a particular region
• Rooted in a locality
• Native to a specific location
• Finish by removing mice, which are prevalent