Study of a Novel Type 1 Oral Poliomyelitis Vaccine in Bangladesh

Официальное название

A Phase 2, Randomized, Observer-blind, Controlled, Age De-escalation, Dosage Escalation Study to Assess Safety and Immunogenicity of a Novel Live Attenuated Type 1 Oral Poliomyelitis Vaccine in Healthy Young Children, Infants, and Neonates in Bangladesh

Обзор

The purpose of this clinical trial is to assess the safety and tolerability (primary objective), immunogenicity (primary and secondary objectives), fecal shedding of vaccine viruses (secondary objective) and the potential for neurovirulence of shed virus (secondary objective) of a novel oral polio type 1 vaccine, nOPV1, as compared to Sabin monovalent type 1 vaccine controls (mOPV1), in healthy young children (192 subjects), infants (720 subjects), and neonates (1320 subjects).

Подробное описание

This single-center trial is the first clinical assessment of nOPV1 in a pediatric population. It will be a 15-arm, randomized, observer-blind, controlled trial, with Sabin monovalent type 1 vaccine (mOPV1) serving as the control. Enrollment in this pediatric study will be staggered into three age-descending cohorts, Cohort 1 composed of 192 healthy young children 1 to less than 5 years of age who have completed their full routine polio immunization series, Cohort 2 composed of 720 healthy infants 6 weeks of age (+6 days) who will receive only one dose of inactivated poliomyelitis vaccine (IPV) on Day 1, and finally Cohort 3, composed of 1320 healthy poliomyelitis unvaccinated neonates (day of birth +3 days). Participants will receive two or three doses of either nOPV1 at dose levels of 10\^5.5 CCID50, 10\^6.0 CCID50, 10\^6.5 CCID50, 10\^7.0 CCID50 or 10\^7.5 CCID50 or the mOPV control vaccine. The second and third doses of vaccine will be given 28 days following the prior dose. In order to demonstrate the vaccine's ability to reduce fecal shedding following a challenge with the Sabin type 1 strain, the infant cohort will be challenged with mOPV 8 weeks after their last dose of nOPV. Participants will be followed until 28 weeks (young children and neonates) or 32 weeks (infants) after their Day 1 vaccination.

Вмешательства

• Биопрепарат Novel Live Attenuated Type 1 Oral Poliomyelitis Vaccine (nOPV1)
  Drop counts of nOPV vaccine will be varied to achieve approximately 10\^5.5, 10\^6.0, 10\^6.5 CCID50 or 10\^7.0, 10\^7.5 dose levels.
• Биопрепарат Sabin Monovalent Oral Poliomyelitis Vaccine Type 1 (mOPV1)
  The Sabin Monovalent Oral Poliomyelitis Vaccine Type 1 control and challenge vaccine (mOPV1) contains ≥ 10\^6.0 CCID50 per 0.1 mL (2 drops) dose.

Первичные конечные точки

• Frequency of serious adverse events (SAEs) from the time of first study vaccination through the end of the study [Срок оценки: From Day 1 to end of study, up to Day 197 (young children and neonates) or Day 225 (infants)]
• Frequency of solicited adverse events (AEs) for 7 days (day of vaccination and 6 following days) after each vaccination [Срок оценки: From vaccination to 7 days post vaccination]
• Frequency of unsolicited AEs for 28 days (day of vaccination and 27 following days) after each vaccination [Срок оценки: From vaccination to 28 days post vaccination]
• Post-vaccination frequency of seroconversion of type 1 anti-polio serum neutralizing antibody (NAb). [Срок оценки: 28 days post second vaccination]

Вторичные конечные точки (9)

• Post-vaccination frequency of seroconversion of type 1 anti-polio serum NAb. [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Median type 1 anti-polio serum NAb titers. [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Type 1 anti-polio serum NAb Geometric Mean Titer (GMT). [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Post-vaccination GMT ratios of type 1 anti-polio serum NAb, adjusted for baseline immunity. [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Seroprotection rate, defined as type 1 anti-polio serum NAb reciprocal titer ≥ 8. [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Geometric mean fold rise (GMFR) in NAb titer relative to baseline [Срок оценки: Baseline and 28 days post vaccination (Day 1 and Day 29 for young children, Day 1, Day 29 and Day 57 for neonates and Day 29, Day 57 and Day 85 for infants)]
• Proportion of participants shedding type 1 poliovirus at any and at each post-vaccination stool collection, as assessed by polymerase chain reaction (PCR) in infants and neonates. [Срок оценки: Baseline through to 28 days post initial vaccination (Day 29 through to Day 57 for infants; Day 1 through to Day 29 for neonates)]
• Proportion of participants shedding type 1 poliovirus at any and at each post-challenge stool collection, as assessed by PCR in infants. [Срок оценки: Day of challenge through to 28 days post challenge (Day 113 through to Day 141 or 169, for infants)]
• Neurovirulence of shed study vaccine virus from select stool samples as measured by a transgenic mouse neurovirulence test in a subset of infants. [Срок оценки: Baseline through to 28 days post initial vaccination (Day 29 through 57 for infants)]

Критерии участия

Inclusion Criteria for all participants:

• Healthy, as defined by the absence of any clinically significant medical condition or congenital anomaly as determined by medical history, physical examination, and clinical assessment of the investigator
• Parent(s) or guardian(s) willing and able to provide written informed consent prior to performance of any study-specific procedure
• Resides in study area and parent understands and is able and willing to adhere to all study visits and procedures (as evidenced by a signed informed consent form \[ICF\] and assessment by the investigator)
• Parent agrees for participant to receive all routine infant and childhood immunizations as per the approved protocol-adjusted schedule

Inclusion Criteria for Cohort 1 (young children) participants only:

• Male or female child from 1 to less than 5 years of age at the time of initial study vaccination
• Based on documentation, previously received a 3 or 4 dose primary poliomyelitis immunization series containing OPV (may have also received IPV), with last dose received more than 3 months prior to initial study vaccination

Inclusion Criteria for Cohort 2 (infants) participants only:

• Male or female infant expected to be 6 weeks of age (43rd to 49th day of life \[with day of birth being the first day of life\], inclusive+ 6-day window), at the time of initial study vaccination
• Prior to study vaccination has received no doses of IPV or OPV, based on no evidence of such vaccination per available documentation.

Inclusion Criteria for Cohort 3 (neonates) participants only:

• Male or female newborn (1st day of life+ 3-day window, inclusive), at the time of initial study vaccination
• Prior to study vaccination has received no doses of IPV or OPV or rotavirus vaccine, based on no evidence of such vaccination per available documentation.

Exclusion Criteria for all participants:

• For all participants, the presence of anyone under 10 years of age in the participant's household (living in the same house or apartment unit) who does not have complete "age appropriate" vaccination status with respect to poliovirus vaccines at the time of study vaccine administration. For household members younger than 10 years of age, "age appropriate" vaccination is complete series of trivalent Oral Poliovirus Vaccine (tOPV) or at least three doses of bivalent (types 1 and 3) Oral Poliovirus Vaccine (bOPV) plus a booster fractional dose of IPV (fractional dose Inactivated Polio Vaccine; fIPV). Note: A vaccination series of tOPV or at least three doses of bOPV with our without a booster fractional dose of IPV will be considered sufficient.
• For all participants, having a member of the participant's household (living in the same house or apartment unit) who has received OPV based on the vaccination records in the previous 3 months before study vaccine administration.
• Any participating children attending day care or pre-school during their participation in the study until one month after their last study vaccine administration.
• Moderate or severe (grade ≥ 2) acute illness at the time of enrollment/first study vaccination - temporary exclusion. Participant with mild (grade 1) acute illnesses may be enrolled at the discretion of the investigator.
• Presence of fever on the day of enrollment/first study vaccination (axillary temperature ≥37.5˚C) - (Temporary exclusion for Cohorts 1 and 2)
• A known allergy, hypersensitivity, or intolerance to any components of the study vaccines, including all macrolide and aminoglycoside antibiotics (e.g., erythromycin and kanamycin)
• Evidence of a clinically significant congenital or genetic defect as judged by the investigator
• History of chronic administration (defined as more than 14 days) of immunosuppressant medications, including corticosteroids (> 0.5mg/kg/day of prednisolone (or equivalent)). Topical and inhaler steroids are permitted (unless indicative of a significant chronic illness otherwise excluding the infant/young child)
• Any self-reported known or suspected immunosuppressive or immunodeficiency condition (including HIV infection) in the participant or household member (living under the same roof/in the same building rather than in the same compound)
• Receipt of any immune-modifying or immunosuppressant drugs within 6 months prior to the first study vaccine dose or planned use during the study of study participants or a household member
• Any known or suspected bleeding disorder in the participant that would pose a risk to venipuncture or intramuscular injection
• Presence of sever malnutrition \[weight-for-length/height z-score greater than or equal to -3 SD median (per WHO published growth standards)\] - temporary exclusion if marginal and subsequently gains weight.
• Participation in another investigational product (drug or vaccine) clinical trial within 30 days prior to entry in this study or receipt of any such investigational product other than the study vaccine within 30 days prior tot he first administration of study vaccine, or planned use during the study period.
• Receipt of transfusion of any blood product or immunoglobulins within 12 months prior to the first administration of study vaccine or planned use during the study period.
• Parent or participant has any condition that in the opinion of the investigator would increase the participant's health risks in the study participation or would increase the risk of not achieving the study's objectives (e.g., would compromise adherence to protocol requirements or interfere with planned safety and immunogenicity assessments.)

Exclusion Criteria for Cohort 2 \& 3 participants only:

• Low birth weight (LBW) in newborn participants which is defined as a birth weight of less than 2500g (up to and including 2499b) at the time of birth or by the time of enrolment.
• Premature birth (less than 37 weeks gestation)
• From multiple birth (due to increased risk of OPV transmission between siblings)

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Распределение

Рандомизированное

Модель

Последовательный дизайн

Маскирование

Четверное слепое

Основная цель

Профилактика

Центры проведения

Bangladesh · 1 центр

• International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b) — Dhaka

Идентификаторы

NCT: NCT05644184 · CVIA 093

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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