Monitoring the impact of Nirsevimab in Chile

The purpose of NirseCL is to monitor the impact of including nirsevimab in the winter campaign in 2024 in Chile on the prevention of respiratory infections caused by Respiratory Syncytial Virus (RSV) in children.

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About the project

The NirseCL study is a collaborative effort between the Ministry of Health of Chile, the Institute of Engineering Systems Complexity (ISCI), and the Faculty of Medicine of the University of Chile. The institutions are working on obtaining and analyzing the necessary data to support the implementation of universal prophylaxis against RSV in infants and to monitor the impact of the recent inclusion of nirsevimab as part of the immunization program during the winter campaign in 2024, funded by the government.

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Updated to 17-01-2025

*Data from hospitals that have not reported or have partially reported hospitalizations have been removed from the analysis.

Cumulative hospitalizations - National results

(*) Infants born between April 1st, 2024 and September 30th, 2024 (NB) and between October 1st, 2023 and March 31th, 2023 (Infants)

Hospitalizaciones acumuladas - Resultados por macrozona, edad ingreso hospital y sexo

(*) Infants born between April 1st, 2024 and September 30th, 2024 (NB) and between October 1st, 2023 and March 31th, 2023 (Infants)

Regions of Northern Macrozone: Arica y Parinacota, Tarapacá, Antofagasta, Atacama.

Regions of Central Macrozone: Coquimbo, Valparaíso, Metropolitana, O'higgins, Maule, Ñuble, BíoBío.

Regions of Southern Macrozone: Araucanía, Los Ríos, Los Lagos, Aysén, Magallanes.

Hospitalizations - Results per macrozone, age, and sex

(*) Infants born between April 1st, 2024 and September 30th, 2024 (NB) and between October 1st, 2023 and March 31th, 2023 (Infants)

Regions of Northern Macrozone: Arica y Parinacota, Tarapacá, Antofagasta, Atacama.

Regiones Macrozona Centro: Coquimbo, Valparaíso, Metropolitana, O'Higgins, Maule, Ñuble, Biobío.

Regions of Southern Macrozone: Araucanía, Los Ríos, Los Lagos, Aysén, Magallanes.

Hospitalization days due to RSV - Eligible population 2024

*These charts exclude information on children born outside of Chile and children with mothers of unknown nationality.