Effectiveness of COVID-19 vaccines in Ecuador: A test-negative design by Francisco Pérez-Tasigchana, Ivette Valcárcel-Pérez, Maribel Arias-Quispe, Lucía Astudillo, Alfredo Bruno, Marco Herrera G., Rubén Armas, Doménica de Mora, Jackeline Pinos, Alfredo Olmedo, Ronald Salas, Ruth Jimbo-Sotomayor, Carlos Chiluisa, Pablo Acosta, Xavier Sánchez, Alvaro Whittembury

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