The impact of an enhanced health surveillance system for COVID-19 management in Serrana, Brazil.

Objective: To describe the successful implementation of an enhanced public health surveillance system based on early detection, tracing contacts, and patient follow-up and support.

Study Design: A prospective observational cohort study conducted in Serrana, São Paulo State, Brazil.

Methods: The implementation was based on four axes: increasing the access to SARS-CoV-2 testing; correct swab collection; testing patients with mild symptoms; and patient follow-up.