Safety and Immunogenicity of a ChAd155-Vectored Respiratory Syncytial Virus Vaccine in Infants 6-7 Months of age: A Phase 1/2 Randomized Trial.
J Infect Dis
; 229(1): 95-107, 2024 Jan 12.
Article
em En
| MEDLINE
| ID: mdl-37477875
ABSTRACT
BACKGROUND:
Respiratory syncytial virus (RSV) is a common cause of lower respiratory tract infections in infants. This phase 1/2, observer-blind, randomized, controlled study assessed the safety and immunogenicity of an investigational chimpanzee-derived adenoviral vector RSV vaccine (ChAd155-RSV, expressing RSV F, N, and M2-1) in infants.METHODS:
Healthy 6- to 7-month-olds were 111-randomized to receive 1 low ChAd155-RSV dose (1.5 × 1010 viral particles) followed by placebo (RSV_1D); 2 high ChAd155-RSV doses (5 × 1010 viral particles) (RSV_2D); or active comparator vaccines/placebo (comparator) on days 1 and 31. Follow-up lasted approximately 2 years.RESULTS:
Two hundred one infants were vaccinated (RSV_1D 65; RSV_2D 71; comparator 65); 159 were RSV-seronaive at baseline. Most solicited and unsolicited adverse events after ChAd155-RSV occurred at similar or lower rates than after active comparators. In infants who developed RSV infection, there was no evidence of vaccine-associated enhanced respiratory disease (VAERD). RSV-A neutralizing titers and RSV F-binding antibody concentrations were higher post-ChAd155-RSV than postcomparator at days 31, 61, and end of RSV season 1 (mean follow-up, 7 months). High-dose ChAd155-RSV induced stronger responses than low-dose, with further increases post-dose 2.CONCLUSIONS:
ChAd155-RSV administered to 6- to 7-month-olds had a reactogenicity/safety profile like other childhood vaccines, showed no evidence of VAERD, and induced a humoral immune response. Clinical Trials Registration. NCT03636906.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Vírus Sincicial Respiratório Humano
/
Infecções por Vírus Respiratório Sincicial
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Vacinas contra Vírus Sincicial Respiratório
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article