Safety and Immunogenicity of 1 or 2 Doses of IPV in Latin American Infants Primed With Bivalent OPV Vaccine

Fidec Corporation1,420 enrolled

Overview

This study is a Phase IV, open, randomized, multi-center, controlled vaccine trial conducted in healthy Latin American infants, utilizing one or two supplemental doses of IPV in children previously vaccinated with 3 doses of bOPV. We will examine the impact of supplemental IPV on stool shedding and humoral immunity, as well as intra-IPV manufacturer comparability, and safety.

The world polio eradication effort is near its goal of reducing the number of new cases of polio to zero. However, final and definitive eradication of the disease will require stopping the use of oral polio vaccines (OPV's) which contain live virus and can rarely revert back to disease producing strains. This period will result in a risk of polio re-emergence as immunity will wane while some vaccine poliovirus will still be circulating. Inactivated polio vaccine (IPV) could potentially play a central role during this process but at present barriers of cost and logistics prevent its routine use in resource limited countries, and concerns exist as to whether IPV provides enough immunity in the intestine to reduce the spread of polioviruses in communities once OPV's are stopped. We plan a multi-center trial in Latin America in which we will administer 1 or 2 doses of IPV to children previously vaccinated with an OPV containing type 1 and 3 poliovirus (bOPV), and then assess the shedding in the stool of a type 2 OPV virus administered later. A decrease in the amount of virus shed compared to children not given IPV would indicate that the IPV boosted intestinal immunity, and would suggest that spread of virus in communities could be reduced using this strategy. We will also measure the impact of supplemental IPV's on antibody formation in the blood, which is a marker of protection of the individual from polio disease. A secondary aim will be to compare the immunogenicity and safety of three IPV's produced by different manufacturers. The overall goal will be to inform policy makers in polio eradication regarding the potential role that one or two doses of IPV might play in the final steps toward polio eradication.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

SINGLE

Enrollment

1,420

Conditions

Poliomyelitis

Interventions

Bivalent Oral Polio Vaccine (bOPV)BIOLOGICAL

Produced by Sanofi Pasteur, Lyon, France, bivalent OPV vaccine contains types 1 and 3 polioviruses and it is indicated for supplementary immunization activities in children from 0 to 5 years of age to prevent or contain outbreaks caused by these 2 serotypes.

Trivalent Oral Polio Vaccine (tOPV)BIOLOGICAL

Produced by Sanofi Pasteur, Lyon, France, trivalent OPV vaccine contains types 1, 2, and 3 polioviruses and it is indicated for routine and supplementary prevention of poliomyelitis in children from 0 to 5 years of age.

Monovalent Oral Polio Vaccine Type 2 (mOPV2)BIOLOGICAL

Licensed monovalent OPV type 2 vaccine (mOPV2) by Glaxo SmithKline, Rixensart, Belgium. Polio Sabin Mono Two (oral) is a monovalent, live attenuated poliomyelitis virus vaccine of the Sabin strain Type 2 (P 712, Ch, 2ab), propagated in MRC5 human diploid cells.

Eligibility

Sex: ALLMin age: 5 WeeksHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. Age: 6 weeks (-7 to +14 days). 2. Healthy without obvious medical conditions that preclude the subject to be in the study as established by the medical history and physical examination. 3. Written informed consent obtained from 1 or 2 parents or legal guardian as per country regulations Exclusion Criteria: 1. Previous vaccination against poliovirus. 2. Low birth weight (BW \<2,500 gm). 3. Multiple pregnancy (twins, triplets, etc.), 4. Any confirmed or suspected immunosuppressive or immunodeficient condition including human immunodeficiency virus (HIV) infection. 5. Family history of congenital or hereditary immunodeficiency. 6. Major congenital defects or serious uncontrolled chronic illness (neurologic, pulmonary, gastrointestinal, hepatic, renal, or endocrine). 7. Known allergy to any component of the study vaccines. 8. Uncontrolled coagulopathy or blood disorder contraindicating intramuscular injections. 9. Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period. 10. Acute severe febrile illness at day of vaccination deemed by the Investigator to be a contraindication for vaccination. 11. Member of the subject's household (living in the same house or apartment unit) who has received OPV vaccine in the last 3 months. 12. Subject who, in the opinion of the Investigator or sub-Investigator, is unlikely to comply with the protocol or is inappropriate to be included in the study for the safety or the benefit-risk ratio of the subject.

Locations (4)

Centro de Estudios en Infectologia Pediatrica - CEIP

Cali, Cali, Colombia

Hospital Maternidad Nuestra Señora de la Altagracia

Santo Domingo, Dominican Republic

Clinica Niño Sano Hospital Roosevelt

Guatemala City, Departamento de Guatemala, Guatemala

Hospital del Niño de Panama

Panama City, Provincia de Panamá, Panama

Outcomes

Primary Outcomes

Change in the stool poliovirus excretion after mOPV2 challenge (shedding index)

The basis for calculation of the quantitative shedding index endpoint is to measure the change of viral concentrations shed in stool post-mOPV2 challenge from the baseline timepoint at day 0 to 7, 14, 21 and 28 days as measured from time of mOPV challenge. Quantitative shedding index endpoint will be computed as an area under the viral shedding curve based on these three log10-transformed measurements.

Time frame: Within 28 days of mOPV2 challenge

Seroconversion and seroprotection to type 1, 2 and 3 poliovirus

The first serologic response endpoint is neutralizing antibody titer defined as the estimated dilution at which 50% neutralizing activity is achieved. The second serologic response endpoint is the binary seroconversion indicator. Seroconversion is considered to be achieved by the time of the subsequent time point if type-specific titers measured at that time are ≥1:8 and \> 4-fold over expected levels of maternally-derived antibody computed from the observed titer at baseline assuming an exponential decay with ½ life of 24 days. The third serologic response endpoint of seroprotection is a binary outcome computed from a single antibody titer measurement with seroprotection being achieved if the measured titer is \> 1:8.

Time frame: At 6 and 14 weeks, and then before and 1 week after mOPV2 challenge

Secondary Outcomes

Comparability of seroconversion and seroprotection from different IPV vaccines

To determine whether IPVs from different manufacturers (Sanofi, GSK, SII) are comparable in their ability to induce/boost an antibody response to the 3 poliovirus serotypes in infants vaccinated with 1 or 2 IPV doses after receiving 3 doses of bOPV at 6, 10, and 14 weeks of age

Time frame: At 6 and 14 weeks, and then before and 1 week after mOPV2 challenge

Safety of each vaccine (tOPV, bOPV, mOPV, Sanofi IPV, GSK IPV and SII IPV) and each vaccine schedule

1. Number of severe adverse events (SAE)throughout the study period 2. Number of important medical events (IME) as protocol defined: up to 28 days post-vaccination 3. Number of Local \& systemic solicited AEs: 3 days post-vaccination

Data from ClinicalTrials.gov

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