[The role of regulatory agencies within health systems during emergencies in BrazilPapel de los organismos regulatorios en los sistemas de salud en situaciones de emergencia en Brasil].

The performance of health systems is related to ensuring the right to health, an important component of human rights that includes the right to health protection. Regulatory action by the state aims to reduce risks to health and thus help improve health system performance, particularly with respect to the principles of comprehensiveness and equity. The aim of this article is to discuss resilience from the perspective of national regulatory agencies - especially when they are faced with public health emergencies (PHEs) - and their contribution to health system resilience, taking as a model the work of the Brazilian Health Regulatory Agency (ANVISA). In the context of PHEs, health regulators have been improving their practices and working on several fronts. Regulatory agencies have used specific regulatory instruments to speed up access to effective and safe products for responding to pandemics, to ensure the quality of care, and to communicate with the public. ANVISA specifically has brought new areas of action under its purview, such as overseeing the development of mechanical ventilators. It is crucial to recognize the interdependence between improving response capacity and improving performance in dealing with PHEs. Examples include the fast-track approval of COVID-19 vaccines, which allowed more rapid vaccination; cooperation among regulatory agencies; and, in the case of Brazil, work by ANVISA to strengthen the role of the country's Unified Health System (SUS) and the right to health in the face of disinformation and denialism.