WILLIAMS, Wendy et al. Challenges to implementation and strengthening of initial COVID-19 surveillance in Vanuatu: January–April 2020. Western Pacific Surveillance and Response, Manila, Philippines, v. 12, n. 2, 2021. DOI: 10.5365/wpsar.2020.11.2.012. Disponível em: https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/762. Acesso em: 3 jun. 2026.