Clinical trial NCT01160562: Pilot Study to Estimate the Burden and Distribution of Plasmodium Falciparum Malaria in Kalifabougou, Mali in Preparation for a Prospective Cohort Study of Naturally-Acquired Malaria Immunity
Official title: Pilot Study to Estimate the Burden and Distribution of Plasmodium Falciparum Malaria in Kalifabougou, Mali in Preparation for a Prospective Cohort Study of Naturally-Acquired Malaria Immunity
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Malaria, Falciparum
Plasmodium Falciparum
Keywords: Prevalence
Incidence
Children
Adults
Global Positioning system
Lead sponsor: National Institutes of Health Clinical Center (CC)
Sponsor class: NIH
First posted: 2010-07-12
Enrollment: 1719
Sex: ALL
Maximum age (years): 25
Standard ages: CHILD
ADULT
Accepts healthy volunteers: no
Time perspective: PROSPECTIVE

Brief summary: Plasmodium falciparum malaria remains a global public health threat. Leading malaria vaccine candidates confer only partial short-lived protection at best. An understanding of the mechanisms by which humans acquire malaria immunity through repeated P. falciparum infections may aid the development of a malaria vaccine. This pilor study is designed to initiate the epidemiological groundwork for a future prospective cohort study of acquired malaria immunity in Kalifabougou, Mali, a rural village of approximately 5 000 individuals who are exposed to seasonal P. falciparum transmission each year from July through December. This study will estimate the age-stratified point prevalence of P. falciparum infection before the malaria season and at the peak of the 6-month malaria season, and it will estimate the age-stratified incidence of symptomatic p. falciparum infection during the 6-month malaria season. The spatial distribution of asymptomatic P. falciparum infections and incident malaria cases within the village of Kalifabougou will be determined by merging the prevalence and incidence data with census and Global Positioning System (GPS) data....

Detailed description: Plasmodium falciparum malaria remains a global public health threat. Leading malaria vaccine candidates confer only partial short-lived protection at best. An understanding of the mechanisms by which humans acquire malaria immunity through repeated P. falciparum infections may aid the development of a malaria vaccine. This pilor study is designed to initiate the epidemiological groundwork for a future prospective cohort study of acquired malaria immunity in Kalifabougou, Mali, a rural village of approximately 5 000 individuals who are exposed to seasonal P. falciparum transmission each year from July through December. This study will estimate the age-stratified point prevalence of P. falciparum infection before the malaria season and at the peak of the 6-month malaria season, and it will estimate the age-stratified incidence of symptomatic p. falciparum infection during the 6-month malaria season. The spatial distribution of asymptomatic P. falciparum infections and incident malaria cases within the village of Kalifabougou will be determined by merging the prevalence and incidence data with census and Global Positioning System (GPS) data.

Eligibility criteria: * INCLUSION CRITERIA:

Cross-sectional Survey:

Individuals (ages 2-25 years) are eligible to enter the cross-sectional study if they agree to:

* Live in Kalifabougou for the next 5 months.
* Have blood specimens stored for future studies.

Passive Surveillance:

All individuals who live in Kalifabougou and present to the Kalifabougou health center with suspected malaria will be eligible to enroll in the passive surveillance component of the protocol.

EXCLUSION CRITERIA:

None.

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Bamako
country: Mali
facility: Malaria Research and Training Center
Study officials:
affiliation: National Institute of Allergy and Infectious Diseases (NIAID)
name: Peter D Crompton, M.D.
role: PRINCIPAL_INVESTIGATOR
References:
citation: Vekemans J, Ballou WR. Plasmodium falciparum malaria vaccines in development. Expert Rev Vaccines. 2008 Mar;7(2):223-40. doi: 10.1586/14760584.7.2.223.
citation: Langhorne J, Ndungu FM, Sponaas AM, Marsh K. Immunity to malaria: more questions than answers. Nat Immunol. 2008 Jul;9(7):725-32. doi: 10.1038/ni.f.205.
citation: Crompton PD, Traore B, Kayentao K, Doumbo S, Ongoiba A, Diakite SA, Krause MA, Doumtabe D, Kone Y, Weiss G, Huang CY, Doumbia S, Guindo A, Fairhurst RM, Miller LH, Pierce SK, Doumbo OK. Sickle cell trait is associated with a delayed onset of malaria: implications for time-to-event analysis in clinical studies of malaria. J Infect Dis. 2008 Nov 1;198(9):1265-75. doi: 10.1086/592224.