Screening for Pfhrp2/3-Deleted Plasmodium falciparum, Non-falciparum, and Low-Density Malaria Infections by a Multiplex Antigen Assay.
J Infect Dis
; 219(3): 437-447, 2019 01 09.
Article
en En
| MEDLINE
| ID: mdl-30202972
ABSTRACT
Background:
Detection of Plasmodium antigens provides evidence of malaria infection status and is the basis for most malaria diagnosis.Methods:
We developed a sensitive bead-based multiplex assay for laboratory use, which simultaneously detects pan-Plasmodium aldolase (pAldo), pan-Plasmodium lactate dehydrogenase (pLDH), and P. falciparum histidine-rich protein 2 (PfHRP2) antigens. The assay was validated against purified recombinant antigens, monospecies malaria infections, and noninfected blood samples. To test against samples collected in an endemic setting, Angolan outpatient samples (n = 1267) were assayed.Results:
Of 466 Angolan samples positive for at least 1 antigen, the most common antigen profiles were PfHRP2+/pAldo+/pLDH+ (167, 36%), PfHRP2+/pAldo-/pLDH- (163, 35%), and PfHRP2+/pAldo+/pLDH- (129, 28%). Antigen profile was predictive of polymerase chain reaction (PCR) positivity and parasite density. Eight Angolan samples (1.7%) had no or very low PfHRP2 but were positive for 1 or both of the other antigens. PCR analysis confirmed 3 (0.6%) were P. ovale infections and 2 (0.4%) represented P. falciparum parasites lacking Pfhrp2 and/or Pfhrp3.Conclusions:
These are the first reports of Pfhrp2/3 deletion mutants in Angola. High-throughput multiplex antigen detection can inexpensively screen for low-density P. falciparum, non-falciparum, and Pfhrp2/3-deleted parasites to provide population-level antigen estimates and identify specimens requiring further molecular characterization.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Plasmodium falciparum
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Pruebas Inmunológicas
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Proteínas Protozoarias
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Antígenos de Protozoos
Tipo de estudio:
Diagnostic_studies
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Prognostic_studies
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Screening_studies
Límite:
Adolescent
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Adult
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Child
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Child, preschool
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Humans
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Infant
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Middle aged
País/Región como asunto:
Africa
Idioma:
En
Revista:
J Infect Dis
Año:
2019
Tipo del documento:
Article
País de afiliación:
Georgia