Effectiveness of Early Immunization With Nirsevimab on Preschool Wheezing in France
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 218,000
- 试验地点
- 1
- 主要终点
- Hospitalization for wheezing episodes among infants immunized with nirsevimab (exposed group) vs non-immunized (non-exposed group)
研究概览
简要总结
Early respiratory syncytial virus (RSV) bronchiolitis is a well-known contributing factor of mid- and long-term respiratory sequelae in children such as recurrent lower tract respiratory infections (LRTIs), preschool wheezing (PW) or decreased lung function at older ages.
Nirsevimab, a monoclonal antibody against RSV with enhanced neutralizing activity and a prolonged half-life, has shown great potential in reducing short term outcomes such as hospitalization for RSV associated bronchiolitis (estimated adjusted effectiveness against hospitalization to 83.0% (95%CI: 73.4 to 89.2). Other countries that have been using nirsevimab almost exhaustively have reported similar results such as in Galicia.
However, prevention of RSV LRTI or delay RSV infection early in life has not been investigated on respiratory manifestations such early wheezing in infancy (ie before 2 years of age) and recurrent wheezing in preschool period (ie between 2 and 6 years old).
Some recent data have shown that nirsevimab was associated with a reduction of wheezing in the year following its administration (HR: 0.73; 95% CI, 0.58-0.93). Other data have shown that not being infected by RSV during the infancy was associated with 26% lower risk of 5-year current asthma than being infected (5) giving good rational for preventive strategies against RSV to impact midterm respiratory outcomes such as PW and then asthma.
Ongoing observational cohort studies will help investigate the question of mid-term effects, but they will come with a high costs and risk of attrition. Administrative national health claims database could prove to be useful and complementary by studying these types of real world outcomes across lives of children that have been immunized by nirsevimab as shown recently.
Therefore, the investigators aim to study the impact of early nirsevimab administration on wheezing manifestations occurring in infancy and beyond during the preschool years.
Our primary objective is to see if nirsevimab administration during the first six months of life has an impact on hospitalization for wheezing episodes during the second year of life, based on the hypothesis that infants who had received nirsevimab have reduced hospitalization for wheezing during their second year of infancy.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Retrospective
入排标准
- 年龄范围
- — 至 1 Year（Child）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •- Exposed group of children: all children born between 06/02/2023 and 31/01/2024 and who had received nirsevimab before 6 or 12 months of age depending on the outcomes that will be studied.
- •Unexposed group of children: all children born between 06/02/2023 and 31/01/2024 and who did not receive nirsevimab
排除标准
- •- Infants born in Overseas Departments and Territories (Guadeloupe, Martinique, Guyana, La Réunion, Mayotte, Saint-Pierre-et-Miquelon, French Polynesia, Nouvelle-Calédonie, Wallis-et-Futuna, French Southern and Antarctic Lands, Clipperton island)
- •Same-sex twins, as they cannot be differentiated in the French Medicalization of Information Systems Program (PMSI)
- •Infants born between 06/02/2023 and 31/01/2024 in a maternity unit that has not reported data on the immunization with nirsevimab
- •Infants whose mother had been vaccinated against RSV during pregnancy
- •Infants who received palivizumab immunization
- •Date of nirsevimab immunization not provided
- •Infants hospitalized for wheezing or RSV+ lower respiratory tract infection before receiving nirsevimab
- •Infants who were immunized after 12 months of age for outcomes collected between 2 and 6 years old
- •Infants who were immunized after 6 months of age for outcomes collected during the second year of life
研究组 & 干预措施
Exposed
Exposed group of children: all children born between 06/02/2023 and 31/01/2024 and who had received nirsevimab before 6 or 12 months of age depending on the outcomes that will be studied.
干预措施: Effectiveness of passive immunization with nirsevimab (Other)
Non-exposed
Unexposed group of children: all children born between June 06/02/2023 and 31/01/2024 and who did not received nirsevimab.
The following matching features will be used to ensure comparability between the two groups: sex, month of birth, department of birth.
Immunized and non-immunized infants will be matched at a 1:2 ratio.
结局指标
主要结局
Hospitalization for wheezing episodes among infants immunized with nirsevimab (exposed group) vs non-immunized (non-exposed group)
时间窗: During the second year of life (exactly between 6 and 24 months of age)
The investigators will compare rates of hospitalization between the two groups. Our primary outcome will be captured by using the asthma-related ICD10 codes J45, J46; bronchiolitis related ICD-10 code J21, respiratory failure J96 and wheezing associated respiratory ill
次要结局
未报告次要终点