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Epidemiology of Malaria in Ubon Ratchathani, Thailand

19. januar 2017 oppdatert av: 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

Studieoversikt

Status

Ukjent

Forhold

Intervensjon / Behandling

Detaljert beskrivelse

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

Studietype

Observasjonsmessig

Registrering (Forventet)

660

Kontakter og plasseringer

Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.

Studiesteder

  • Thailand
    • Ubon Rachatani
      • Ubon Ratchathani, Ubon Rachatani, Thailand, 34230
        • Rekruttering
        • Buntharik Hospital
        • Ta kontakt med:
        • Ta kontakt med:
        • Hovedetterforsker:
          • Tanong Kamsri, doctor

Deltakelseskriterier

Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.

Kvalifikasjonskriterier

Alder som er kvalifisert for studier

6 måneder og eldre (Barn, Voksen, Eldre voksen)

Tar imot friske frivillige

Nei

Kjønn som er kvalifisert for studier

Alle

Prøvetakingsmetode

Ikke-sannsynlighetsprøve

Studiepopulasjon

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.

Beskrivelse

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.

Studieplan

Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.

Hvordan er studiet utformet?

Designdetaljer

  • Observasjonsmodeller: Case-Control
  • Tidsperspektiver: Potensielle

Kohorter og intervensjoner

Gruppe / Kohort
Intervensjon / Behandling
Case
Malaria patient defined by positive RDT or blood smear
Annen: 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
Annen: Blood collection (Dried Blood Spot)
Dried Blood Spot
Annen: Blood Collection (Venous Blood collection)
Venous Blood collection
Annen: Blood Smear
Slide blood smear
Control
Non-malaria patient defined by negative RDT or blood smear
Annen: 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
Annen: Blood Collection (Venous Blood collection)
Venous Blood collection
Annen: Blood Smear
Slide blood smear

Hva måler studien?

Primære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Risk factors for Malaria infection
Tidsramme: 2 years
Risk factors for malaria infection in Ubon Ratchathani Province, Thailand
2 years

Sekundære resultatmål

Resultatmål
Tiltaksbeskrivelse
Tidsramme
Proportion of malaria infections in Ubon Ratchathani Province
Tidsramme: 2 years
Proportion of malaria infections that are imported in Ubon Ratchathani Province, Thailand
2 years
Prevalence of clinical antimalarial drug resistance
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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

Samarbeidspartnere og etterforskere

Det er her du vil finne personer og organisasjoner som er involvert i denne studien.

Sponsor

University of Oxford

Samarbeidspartnere

Mahidol Oxford Tropical Medicine Research Unit

Studierekorddatoer

Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.

Studer hoveddatoer

Studiestart (Faktiske)

1. desember 2016

Primær fullføring (Forventet)

1. desember 2018

Studiet fullført (Forventet)

1. desember 2018

Datoer for studieregistrering

Først innsendt

9. desember 2016

Først innsendt som oppfylte QC-kriteriene

13. desember 2016

Først lagt ut (Anslag)

14. desember 2016

Oppdateringer av studieposter

Sist oppdatering lagt ut (Anslag)

20. januar 2017

Siste oppdatering sendt inn som oppfylte QC-kriteriene

19. januar 2017

Sist bekreftet

1. januar 2017

Mer informasjon

Begreper knyttet til denne studien

Ytterligere relevante MeSH-vilkår

Andre studie-ID-numre

  • EPI1601

Plan for individuelle deltakerdata (IPD)

Planlegger du å dele individuelle deltakerdata (IPD)?

Ja

IPD-planbeskrivelse

According to Mahidol-Oxford Tropical Medicine Research Unit policy

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