Following the confirmation of a positive vaccine-derived polio virus sample in 2021, Walimu deployed surveillance officers to support the Community Health Departments in the Regional Referral Hospitals. They have investigated and verified over 800 acute flaccid paralysis cases, supervised 1,300 health workers and mentored 4,600 health workers, in order to build surveillance capacity for notifiable diseases. They also established and replicated district-based surveillance improvement plans, paving the weigh for better surveillance over time.