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Epidemiology of Malaria in Ubon Ratchathani, Thailand

19 janvier 2017 mis à jour par: University of Oxford

Epidemiology of Malaria in Ubon Ratchathani, Thailand: a Case-control Study

This is an observational study (case-control study) aiming to identify risk factors for malaria infection in health centers or malaria posts or district hospitals in Buntharik District and Nachalui District, Ubon Ratchathani Province, Thailand.

This study expects to recruit 330 cases (malaria positive) and 330 control (negative cases) subject. One-to-one matching of cases (malaria positive) and controls (malaria negative) will be done at each study site.

CASE (Malaria positive) subject will go through the following;

  1. Enrollment visit (Day 0)

    1.1 Blood collection of three dried blood spots, and malaria slide. In district hospitals in individuals >14 kg: additional 10ml venous blood will be collected.

    1.2 A survey questionnaire which includes patient demographics, information on malaria treatment, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phones will be administered.

  2. Follow up visits (if fever plus Day 42 (+/-3))

2.1 Blood collection of three dried blood spots and malaria slide. In district hospitals: additional 0.5ml venous blood will be collected.

2.2 Short survey questionnaire including questions on symptoms, travel and possible risk behaviors since enrollment will be administered.

CONTROL (Malaria negative) subject will go through the following;

  1. Enrollment visit (Day 0)

    1.1 Blood collection to confirm negative malaria slide. In district hospitals: additional 0.5ml venous blood will be collected.

    1.2 A survey questionnaire including patient demographics, information on any recent malaria treatment they may have taken, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phones will be administered.

  2. Follow up visit: No follow up visit

Aperçu de l'étude

Statut

Inconnue

Les conditions

Intervention / Traitement

Description détaillée

Study sites and enrollment:

Patients self-presenting to (1) health centres or(2) malaria posts or (3) district hospitals in Buntharik District and Nachalui District, Ubon Ratchathani Province, Thailand and requiring a diagnostic test for malaria as determined by the treating clinician will be recruited. Those who are malaria positive will be candidate cases and those who are malaria negative will be candidate controls.

One-to-one matching of cases and controls will be done at each study site. One control will be matched to each case. The matching criteria will be the next malaria negative patient to attend the study site of the same gender and age+/-5 years as an enrolled malaria positive case.

Study procedure:

CASE (Malaria patient defined by positive RDT or blood smear)

Upon enrollment, the below study procedures will be followed;

  1. Blood samples consisting of:

    • Three dried blood spots
    • A microscopy slide
    • In the district hospitals only, 10 ml of venous blood will be taken from the positive for malaria patient.
  2. A survey include patient demographics, information on malaria treatment, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phone will be administered to each patient.

CONTROL (Non-malaria patient defined by negative RDT or blood smear)

Upon enrollment, for those negative for malaria, the below study procedures will be follows;

  1. Blood samples consisting of:

    • Blood smear
    • In the district hospitals only, 0.5 ml of venous blood will also be collected.
  2. A survey include patient demographics, information on malaria treatment, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phone swill be administered to each patient.

CASE: Follow-up

  • If patients develop a fever after the end of antimalarial treatment and within 42 days after enrollment, they will be asked to return for follow-up as soon as possible on one occasion and then again at 42 (+/-3) days.
  • If they do not develop fever within 42 days after enrollment, they will be asked to return for follow up at 42 (+/-3) days.

At the follow-up visit, blood will be taken to test for malaria by microscopy, three dried blood spots will be taken and a short survey administered including questions on symptoms, travel and possible risk behaviors since enrollment.

*In the district hospitals only, 1.5ml of venous blood will be taken

CONTROL: No follow up

Type d'étude

Observationnel

Inscription (Anticipé)

660

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

  • Thaïlande
    • Ubon Rachatani
      • Ubon Ratchathani, Ubon Rachatani, Thaïlande, 34230
        • Recrutement
        • Buntharik Hospital
        • Contact:
        • Contact:
        • Chercheur principal:
          • Tanong Kamsri, doctor

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

6 mois et plus (Enfant, Adulte, Adulte plus âgé)

Accepte les volontaires sains

Non

Sexes éligibles pour l'étude

Tout

Méthode d'échantillonnage

Échantillon non probabiliste

Population étudiée

Patients self-presenting to health centres or malaria posts or district hospitals in Buntharik District and Nachalui District, Ubon Ratchathani Province, Thailand and requiring a diagnostic test for malaria as determined by the treating clinician will be recruited. Those who are malaria positive will be candidate cases and those who are malaria negative will be candidate controls.

La description

Inclusion Criteria:

- Case (Malaria patient defined by positive RDT or blood smear):

  • Patients of ≥ 6 months of age testing positive for malaria of any species as determined by a positive rapid diagnostic test (RDT) or asexual stage parasites on a smear of peripheral blood including individuals with more than one species of Plasmodium.

    • Control (Non-malaria patient defined by negative RDT or blood smear):
  • Patients > 6 months of age requiring a diagnostic test for malaria but testing negative for malaria by rapid diagnostic test (RDT) or asexual stage parasites on a smear of peripheral blood. Controls will be age and gender matched to individual cases at each study site (details below).

Exclusion Criteria:

Not willing to provide written informed consent.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Modèles d'observation: Cas-témoins
  • Perspectives temporelles: Éventuel

Cohortes et interventions

Groupe / Cohorte
Intervention / Traitement
Case
Malaria patient defined by positive RDT or blood smear
Autre: Interview
A survey will be included patient demographics, information on malaria treatment, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phones
Autre: Blood collection (Dried Blood Spot)
Dried Blood Spot
Autre: Blood Collection (Venous Blood collection)
Venous Blood collection
Autre: Blood Smear
Slide blood smear
Control
Non-malaria patient defined by negative RDT or blood smear
Autre: Interview
A survey will be included patient demographics, information on malaria treatment, bed net use and possible risk factors for acquiring malaria, as well as questions about their travel and usage of mobile phones
Autre: Blood Collection (Venous Blood collection)
Venous Blood collection
Autre: Blood Smear
Slide blood smear

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Risk factors for Malaria infection
Délai: 2 years
Risk factors for malaria infection in Ubon Ratchathani Province, Thailand
2 years

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Proportion of malaria infections in Ubon Ratchathani Province
Délai: 2 years
Proportion of malaria infections that are imported in Ubon Ratchathani Province, Thailand
2 years
Prevalence of clinical antimalarial drug resistance
Délai: 2 years
Prevalence of clinical antimalarial drug resistance in cases of P. falciparum malaria in Ubon Ratchathani Province, Thailand
2 years
Human movement leading to spread of malaria and antimalarial drug resistance
Délai: 2 years
4. Estimates of the potential for spread of malaria and antimalarial drug resistance from Ubon Ratchathani Province, Thailand through human movement to other locations.
2 years
Measure antimalarial drug in blood prior to participate in the study
Délai: 2 years
List of antimalarials which patients have recently taken, if any, prior to presentation in order to estimate drug pressure on the parasite population.
2 years

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

University of Oxford

Collaborateurs

Mahidol Oxford Tropical Medicine Research Unit

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Réel)

1 décembre 2016

Achèvement primaire (Anticipé)

1 décembre 2018

Achèvement de l'étude (Anticipé)

1 décembre 2018

Dates d'inscription aux études

Première soumission

9 décembre 2016

Première soumission répondant aux critères de contrôle qualité

13 décembre 2016

Première publication (Estimation)

14 décembre 2016

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Estimation)

20 janvier 2017

Dernière mise à jour soumise répondant aux critères de contrôle qualité

19 janvier 2017

Dernière vérification

1 janvier 2017

Plus d'information

Termes liés à cette étude

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • EPI1601

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

Oui

Description du régime IPD

According to Mahidol-Oxford Tropical Medicine Research Unit policy

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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