A single-dose live-attenuated Zika Virus vaccine with controlled infection rounds that protects against vertical transmission

• Autor(a) principal: Xie, Xuping
• Data de Publicação: 2018
• Outros Autores: Kum, Dieudonné B, Xia, Hongjie, Luo, Huanle, Shan, Chao, Zou, Jing, Muruato, Antonio E, Medeiros, Daniele Barbosa de Almeida, Nunes, Bruno Tardelli Diniz, Dallmeier, Kai, Rossi, Shannan L, Weaver, Scott C, Neyts, Johan, Wang, Tian, Vasconcelos, Pedro Fernando da Costa, Shi, Pei-Yong
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Digital do Instituto Evandro Chagas (Patuá)
• Texto Completo: https://patua.iec.gov.br/handle/iec/3517
• topic: Vacinas / imunologia; Zika virus / patogenicidade; Vacinas / antagonistas & inibidores; Infecção pelo Zika virus; Proteínas do Capsídeo; Ensaio Clínico; Estudos de Validação

Zika virus (ZIKV) infection of the mother during pregnancy causes devastating Zika congenital syndrome in the offspring. A ZIKV vaccine with optimal safety and immunogenicity for use in pregnant women is critically needed. Toward this goal, we have developed a single-dose live-attenuated vaccine candidate that infects cells with controlled, limited infection rounds. The vaccine contains a 9-amino-acid deletion in the viral capsid protein and replicates to titers of > 10 6 focus-forming units (FFU)/mL in cells expressing the full-length capsid protein. Immunization of A129 mice with one dose (10 5 FFU) did not produce viremia, but elicited protective immunity that completely prevented viremia, morbidity, and mortality after challenge with an epidemic ZIKV strain (10 6 PFU). A single-dose vaccination also fully prevented infection of pregnant mice and maternal-to-fetal transmission. Intracranial injection of the vaccine (10 4 FFU) to 1-day-old mice did not cause any disease or death, underscoring the safety of this vaccine candidate.