- ICH GCP
- Реестр клинических исследований США
- Клиническое испытание NCT07749911
Assessing Vaccine Effectiveness of R21/Matrix-M Across Malaria Transmission Settings (AVERT) (AVERT)
Real-World Effectiveness of the R21/Matrix-M Malaria Vaccine in Children in Burkina Faso and Uganda
Обзор исследования
Статус
Условия
Вмешательство/лечение
Подробное описание
R21/Matrix-M has been introduced through national immunization programs, but its effectiveness under routine conditions may differ from efficacy observed in clinical trials because children may receive different numbers of doses, doses may be delayed, protection may wane, and malaria transmission and other prevention measures vary across settings.
AVERT will use a prospective test-negative case-control design at approximately 22 outpatient health facilities in moderate- to high-transmission areas of Burkina Faso and Uganda. Consecutive children younger than 5 years who meet country definitions for suspected malaria, are eligible for R21/Matrix-M vaccination, and have caregiver consent will be enrolled. All participants will undergo malaria testing as part of routine care, with study blood smear microscopy used to assign case or control status. A structured caregiver questionnaire will collect demographic, clinical, residential, socioeconomic, health-care access, and malaria-prevention information. R21/Matrix-M dose number and vaccination dates will be verified primarily from vaccination cards, individual health records, or facility vaccination registers.
Cases and controls will be matched, when feasible, by geographic area and calendar time. Conditional or standard logistic regression will estimate adjusted odds ratios comparing vaccinated and unvaccinated children, and vaccine effectiveness will be calculated as (1 - adjusted odds ratio) x 100%. Analyses will be conducted separately by country and will assess effectiveness by dose, time since vaccination, dose spacing, transmission intensity, sex, and use of seasonal malaria chemoprevention, insecticide-treated nets, and indoor residual spraying. A health-system-perspective economic evaluation will estimate incremental cost per uncomplicated clinical malaria case averted.
Тип исследования
Регистрация (Оцененный)
Контакты и местонахождение
Места учебы
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Boucle Mouhoun
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Boromo, Boucle Mouhoun, Буркина-Фасо
- Рекрутинг
- Boromo urbain 1
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Boromo, Boucle Mouhoun, Буркина-Фасо
- Рекрутинг
- Ouahabou
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Контакт:
- h Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Hauts-Bassins Region
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Houndé, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Béréba
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Houndé, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Dohoun
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Houndé, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Kari
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Контакт:
- Halidou Tinto
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Karangasso-Vigué, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Déguélin
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Karangasso-Vigué, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Karangasso-Vigué
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Karangasso-Vigué, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Sourmousso
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Karangasso-Vigué, Hauts-Bassins Region, Буркина-Фасо
- Рекрутинг
- Wara
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Oubri
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Zorgo, Oubri, Буркина-Фасо
- Рекрутинг
- Mankarga T
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Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Zorgo, Oubri, Буркина-Фасо
- Рекрутинг
- Mankarga V3
-
Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Zorgo, Oubri, Буркина-Фасо
- Рекрутинг
- Mankarga V6
-
Контакт:
- Halidou Tinto, PhD
- Номер телефона: +226 25 40 92 12
- Электронная почта: tintoh@crun.bf
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Acholi
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Kitgum, Acholi, Уганда
- Еще не набирают
- Kitgum-Matidi HCIII
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Kitgum, Acholi, Уганда
- Еще не набирают
- Namokora HCIV
-
Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Omoro, Acholi, Уганда
- Еще не набирают
- Lalogi HCIV
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Bunyoro
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Kikube, Bunyoro, Уганда
- Еще не набирают
- Rwenyawawa HCIII
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Busoga
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Kaliro, Busoga, Уганда
- Еще не набирают
- Nawaikoke HCIII
-
Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Mayuge, Busoga, Уганда
- Еще не набирают
- Kigandalo HCIV
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Karamoja
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Moroto, Karamoja, Уганда
- Еще не набирают
- Nadunget HCIII
-
Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Lango
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Otuke, Lango, Уганда
- Еще не набирают
- Orum HCIV
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Oyam, Lango, Уганда
- Еще не набирают
- Otwal HCIII
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Контакт:
- Joaniter Nankabirwa, MD, PhD
- Номер телефона: 256 (0) 312 281 479
- Электронная почта: jnankabirwa@idrc-uganda.org
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Критерии участия
Критерии приемлемости
Возраст, подходящий для обучения
- Ребенок
Принимает здоровых добровольцев
Метод выборки
Исследуемая популяция
Описание
Inclusion Criteria:
- Residence in an area where R21/Matrix-M is implemented and within the catchment area of a selected study facility.
- Younger than 5 years and eligibleto receive R21/Matrix-M under the national vaccination schedule at rollout.
- Meets the country definition of suspected malaria, generally axillary temperature of at least 37.5 degrees Celsius or a history of fever within the previous 24 hours, and is undergoing malaria testing.
- Written informed consent provided by an adult caregiver aged 18 years or older.
Exclusion Criteria:
- Caregiver is unable or unwilling to provide informed consent.
- Severe non-malaria illness at presentation that would interfere with study participation.
- Repeat presentation within the protocol-defined exclusion window after a previous enrollment: within 14 days after a microscopy-positive visit; or more than 7 but fewer than 14 days after a microscopy-negative visit. A microscopy-negative visit followed by a positive diagnosis within 7 days will be reclassified as positive rather than treated as a new enrollment.
- Documented receipt of any RTS,S malaria vaccine dose.
Учебный план
Как устроено исследование?
Детали дизайна
Когорты и вмешательства
Группа / когорта |
Вмешательство/лечение |
|---|---|
|
Suspected malaria cases that test positive using microscopy
Eligible children with suspected malaria whose enrollment blood smear microscopy result is positive for P. falciparum infection
|
R21/Matrix-M vaccination received through routine national immunization programs.
The study will record the number and dates of doses received.
Children will be classified as having received 0, 1, 2, 3, or 4 eligible doses, with prespecified grouped classifications used if individual dose categories are underpowered.
Doses given fewer than 14 days before malaria testing will not count toward the primary exposure classification.
|
|
Suspected malaria cases that test negative using microscopy
Eligible children with suspected malaria whose enrollment blood smear microscopy result is negative for P. falciparum infection
|
R21/Matrix-M vaccination received through routine national immunization programs.
The study will record the number and dates of doses received.
Children will be classified as having received 0, 1, 2, 3, or 4 eligible doses, with prespecified grouped classifications used if individual dose categories are underpowered.
Doses given fewer than 14 days before malaria testing will not count toward the primary exposure classification.
|
Что измеряет исследование?
Первичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
|---|---|---|
|
Dose-specific effectiveness of R21/Matrix-M against microscopy-confirmed clinical malaria
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month study recruitment period
|
Adjusted vaccine effectiveness will be calculated as (1 - adjusted odds ratio) x 100%.
The odds ratio will compare the odds of each documented R21/Matrix-M dose category among microscopy-positive malaria cases with the odds among microscopy-negative controls, using children with 0 doses as the primary reference group.
Prespecified grouped dose categories will be used if individual dose categories do not have adequate statistical power.
|
At the enrollment illness episode, during the approximately 7- to 8-month study recruitment period
|
Вторичные показатели результатов
Мера результата |
Мера Описание |
Временное ограничение |
|---|---|---|
|
Effectiveness of R21/Matrix-M by time since vaccination
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Adjusted vaccine effectiveness will be estimated by categorical and/or continuous time since the most recent eligible vaccine dose, including interactions between dose and time.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
|
Effect modification of vaccine effectiveness by malaria transmission intensity
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Dose-specific vaccine effectiveness will be compared across prespecified malaria transmission levels within each country.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
|
Effect modification of vaccine effectiveness by sex
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Dose-specific vaccine effectiveness will be estimated using vaccination-by-sex interaction terms and sex-stratified analyses.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
|
Effect modification by other malaria prevention interventions
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Dose-specific vaccine effectiveness will be assessed in relation to seasonal malaria chemoprevention, insecticide-treated net use, and indoor residual spraying using interaction analyses.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
|
Effectiveness according to vaccine dose timing
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Among vaccinated children, effectiveness will be compared for on-time and late vaccination and in analyses restricted to doses spaced 3 to 5 weeks apart.
A late dose is defined as a dose received at least 2 weeks after the scheduled date.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
|
Effectiveness of the fourth dose relative to the three-dose primary series
Временное ограничение: At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Adjusted vaccine effectiveness of 4 doses compared with 3 doses will be estimated using the odds of microscopy-confirmed malaria.
|
At the enrollment illness episode, during the approximately 7- to 8-month recruitment period
|
Соавторы и исследователи
Соавторы
Следователи
- Главный следователь: Isabel Rodriguez-Barraquer, MD, PhD, University of California, San Francisco
- Главный следователь: Halidou Tinto, PhD, Institut de Recherche en Sciences de la Santé (Burkina Faso)
- Главный следователь: Joaniter Nankabirwa, MD, PhD, Infectious Diseases Research Collaboration, Kampala, Uganda
Даты записи исследования
Изучение основных дат
Начало исследования (Действительный)
Первичное завершение (Оцененный)
Завершение исследования (Оцененный)
Даты регистрации исследования
Первый отправленный
Впервые представлено, что соответствует критериям контроля качества
Первый опубликованный (Действительный)
Обновления учебных записей
Последнее опубликованное обновление (Действительный)
Последнее отправленное обновление, отвечающее критериям контроля качества
Последняя проверка
Дополнительная информация
Термины, связанные с этим исследованием
Ключевые слова
Дополнительные соответствующие термины MeSH
Другие идентификационные номера исследования
- AVERT-2026-01
- INV-097482 (Другой номер гранта/финансирования: Gates Foundation)
- 2026-06-05 (Другой номер гранта/финансирования: Givewell)
Планирование данных отдельных участников (IPD)
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