Social & Preventive Medicine Key indicator for AFP surveillance ?. A At least one case of non-polio AFP per year per 1000 population of under 5 years B At least one case of non-polio AFP per year per 100000 population of under 5 year C At least one case of non-polio AFP per year per 1000 population of under 15 years D At least one case of non-polio AFP per year per 100000 population of under 15 years 💡 Explanation Key indicator for AFP surveillance ?. ✓ Correct Answer: D. At least one case of non-polio AFP per year per 100000 population of under 15 years