2024
Noninvasive in vivo photoacoustic detection of malaria with Cytophone in Cameroon
Yadem A, Armstrong J, Sarimollaoglu M, Kiki Massa C, Ndifo J, Menyaev Y, Mbe A, Richards K, Wade M, Zeng Y, Chen R, Zhou Q, Meten E, Ntone R, Tchuedji Y, Ullah S, Galanzha E, Eteki L, Gonsu H, Biris A, Suen J, Boum Y, Zharov V, Parikh S. Noninvasive in vivo photoacoustic detection of malaria with Cytophone in Cameroon. Nature Communications 2024, 15: 9228. PMID: 39455558, PMCID: PMC11511992, DOI: 10.1038/s41467-024-53243-z.Peer-Reviewed Original ResearchConceptsClearance of parasitemiaDetection of malariaMalaria-infected red blood cellsDiagnosed symptomatic casesCross-sectional cohortUncomplicated malariaMalaria diagnosticsMalaria infectionRed blood cellsSymptomatic casesTarget antigenAsymptomatic reservoirCameroonian adultsFlow cytometer platformBlood samplesReservoir of infectionBlood cellsLack sensitivityLongitudinal cohortMolecular assaysMalariaIRBCPoint-of-careCohortQuantitative PCR
2021
Design and analysis of a 2-year parallel follow-up of repeated ivermectin mass drug administrations for control of malaria: Small sample considerations for cluster-randomized trials with count data
Jackson CL, Colborn K, Gao D, Rao S, Slater HC, Parikh S, Foy BD, Kittelson J. Design and analysis of a 2-year parallel follow-up of repeated ivermectin mass drug administrations for control of malaria: Small sample considerations for cluster-randomized trials with count data. Clinical Trials 2021, 18: 582-593. PMID: 34218684, PMCID: PMC8478782, DOI: 10.1177/17407745211028581.Peer-Reviewed Original ResearchConceptsIvermectin mass drug administrationMass drug administrationCluster-randomized trialControl of malariaCluster-randomized trial designDrug AdministrationCrossover designMixed effects modelsTrial designStudy designCluster-level analysisSmall sample sizeCluster-level summariesCluster-level interventionsParallel trialRisk of harmPrimary analysisMalariaAdministrationMixed-effects modelsTrialsLevel interventionsSample sizeAdditional evaluationParallel design
2020
An Individual Participant Data Population Pharmacokinetic Meta-analysis of Drug-Drug Interactions between Lumefantrine and Commonly Used Antiretroviral Treatment
Francis J, Barnes KI, Workman L, Kredo T, Vestergaard LS, Hoglund RM, Byakika-Kibwika P, Lamorde M, Walimbwa SI, Chijioke-Nwauche I, Sutherland CJ, Merry C, Scarsi KK, Nyagonde N, Lemnge MM, Khoo SH, Bygbjerg IC, Parikh S, Aweeka FT, Tarning J, Denti P. An Individual Participant Data Population Pharmacokinetic Meta-analysis of Drug-Drug Interactions between Lumefantrine and Commonly Used Antiretroviral Treatment. Antimicrobial Agents And Chemotherapy 2020, 64: 10.1128/aac.02394-19. PMID: 32071050, PMCID: PMC7179577, DOI: 10.1128/aac.02394-19.Peer-Reviewed Original ResearchConceptsDrug-drug interactionsAntiretroviral therapyDolutegravir-based antiretroviral therapyPotential drug-drug interactionsDay 7 concentrationsIndividual participant dataConcomitant efavirenzLopinavir-ritonavirLumefantrine exposureLumefantrine regimenAntituberculosis treatmentUncomplicated malariaAntiretroviral treatmentHIV infectionTreatment failurePopulation pharmacokineticsLumefantrine concentrationsLarger body weightBody weightEfavirenzParticipant dataLumefantrineMalariaAdult participantsRifampin
2019
Immunoepidemiology of Plasmodium falciparum malaria
Bei A, Parikh S. Immunoepidemiology of Plasmodium falciparum malaria. 2019, 193-213. DOI: 10.1007/978-3-030-25553-4_12.Peer-Reviewed Original Research
2016
Population Pharmacokinetics and Pharmacodynamics of Lumefantrine in Young Ugandan Children Treated With Artemether-Lumefantrine for Uncomplicated Malaria
Tchaparian E, Sambol NC, Arinaitwe E, McCormack SA, Bigira V, Wanzira H, Muhindo M, Creek DJ, Sukumar N, Blessborn D, Tappero JW, Kakuru A, Bergqvist Y, Aweeka FT, Parikh S. Population Pharmacokinetics and Pharmacodynamics of Lumefantrine in Young Ugandan Children Treated With Artemether-Lumefantrine for Uncomplicated Malaria. The Journal Of Infectious Diseases 2016, 214: 1243-1251. PMID: 27471317, PMCID: PMC5034953, DOI: 10.1093/infdis/jiw338.Peer-Reviewed Original ResearchConceptsArtemether-lumefantrineRecurrent parasitemiaLumefantrine exposurePopulation pharmacokineticsUgandan childrenYoung Ugandan childrenPlasmodium falciparum malariaDay 7 concentrationsAge 6 monthsFirst-order absorptionWhole blood concentrationsYoung childrenUncomplicated malariaFalciparum malariaBlood concentrationsTreatment outcomesLumefantrine concentrationsSignificant positive correlationParasitemiaOlder childrenPharmacokineticsLumefantrineMalariaExposure levelsOpen model
2015
Population Pharmacokinetics of Piperaquine in Young Ugandan Children Treated With Dihydroartemisinin‐Piperaquine for Uncomplicated Malaria
Sambol N, Yan L, Creek D, McCormack S, Arinaitwe E, Bigira V, Wanzira H, Kakuru A, Tappero J, Lindegardh N, Tarning J, Nosten F, Aweeka F, Parikh S. Population Pharmacokinetics of Piperaquine in Young Ugandan Children Treated With Dihydroartemisinin‐Piperaquine for Uncomplicated Malaria. Clinical Pharmacology & Therapeutics 2015, 98: 87-95. PMID: 25732044, PMCID: PMC5088713, DOI: 10.1002/cpt.104.Peer-Reviewed Original ResearchConceptsUncomplicated malariaPopulation pharmacokineticsYoung Ugandan childrenWeight-based dosingChildren 6 monthsAge-specific guidelinesClearance/bioavailabilityFirst-order absorptionDihydroartemisinin-PiperaquinePiperaquine exposureMalaria episodesProspective trialOral dosesUgandan childrenPlasma concentrationsThree-compartment modelDay 7High dosesAge groupsEarly childhoodPiperaquineDosingPharmacokineticsMalariaPhysiological changes
2013
Biochemical and immunological mechanisms by which sickle cell trait protects against malaria
Gong L, Parikh S, Rosenthal PJ, Greenhouse B. Biochemical and immunological mechanisms by which sickle cell trait protects against malaria. Malaria Journal 2013, 12: 317. PMID: 24025776, PMCID: PMC3847285, DOI: 10.1186/1475-2875-12-317.Peer-Reviewed Original ResearchConceptsSickle cell traitCell traitImmune-mediated mechanismsHost immune systemFalciparum malariaImmunological mechanismsProtective effectHO-1Immune componentsMultiple complex mechanismsImmune systemMalariaObserved protectionGenetic polymorphismsHost-parasite relationshipMicro RNAsNovel mechanismRelevant mechanismsDiseaseComplex mechanismsParasitic growthPharmacokinetic Predictors for Recurrent Malaria After Dihydroartemisinin-Piperaquine Treatment of Uncomplicated Malaria in Ugandan Infants
Creek DJ, Bigira V, McCormack S, Arinaitwe E, Wanzira H, Kakuru A, Tappero JW, Sandison TG, Lindegardh N, Nosten F, Aweeka FT, Parikh S. Pharmacokinetic Predictors for Recurrent Malaria After Dihydroartemisinin-Piperaquine Treatment of Uncomplicated Malaria in Ugandan Infants. The Journal Of Infectious Diseases 2013, 207: 1646-1654. PMID: 23447696, PMCID: PMC4318925, DOI: 10.1093/infdis/jit078.Peer-Reviewed Original ResearchConceptsPiperaquine concentrationsRecurrent malariaDay 7TMP-SMXDihydroartemisinin-piperaquine treatmentPK/PD studiesTMP-SMX prophylaxisTrimethoprim-sulfamethoxazole prophylaxisTime of presentationPK/PD dataYears of ageYoung childrenPiperaquine exposureUgandan infantsUncomplicated malariaMalaria treatmentPharmacodynamic dataDP useDay 28PD studiesMalariaDay 63Strong associationPQ concentrationProphylaxis
2012
Population Pharmacokinetics and Pharmacodynamics of Piperaquine in Children With Uncomplicated Falciparum Malaria
Tarning J, Zongo I, Somé FA, Rouamba N, Parikh S, Rosenthal PJ, Hanpithakpong W, Jongrak N, Day NP, White NJ, Nosten F, Ouedraogo J, Lindegardh N. Population Pharmacokinetics and Pharmacodynamics of Piperaquine in Children With Uncomplicated Falciparum Malaria. Clinical Pharmacology & Therapeutics 2012, 91: 497-505. PMID: 22258469, PMCID: PMC3736305, DOI: 10.1038/clpt.2011.254.Peer-Reviewed Original ResearchConceptsUncomplicated falciparum malariaFalciparum malariaPopulation pharmacokineticsThree-compartment distribution modelNonlinear mixed-effects modelingRecurrent malaria infectionsTotal piperaquine exposureArtemisinin combination treatmentWeight-normalized dosePlasma concentration-time profilesYoung childrenMixed-effects modelingConcentration-time profilesPiperaquine concentrationsPiperaquine exposureDose regimenMalaria infectionPlasma concentrationsPharmacodynamic propertiesCombination treatmentBody weightPiperaquineSignificant covariatesOlder childrenMalaria
2009
Intermittent Preventive Therapy for Malaria in Pregnancy: Is Sulfadoxine–Pyrimethamine the Right Drug?
Parikh S, Rosenthal PJ. Intermittent Preventive Therapy for Malaria in Pregnancy: Is Sulfadoxine–Pyrimethamine the Right Drug? Clinical Pharmacology & Therapeutics 2009, 87: 160-162. PMID: 20107451, DOI: 10.1038/clpt.2009.284.Peer-Reviewed Original Research
2004
Host polymorphisms and the incidence of malaria in Ugandan children.
Parikh S, Dorsey G, Rosenthal PJ. Host polymorphisms and the incidence of malaria in Ugandan children. American Journal Of Tropical Medicine And Hygiene 2004, 71: 750-3. PMID: 15642965, DOI: 10.4269/ajtmh.2004.71.750.Peer-Reviewed Original ResearchConceptsInducible nitric oxide synthaseWild-type childrenUgandan childrenLower incidenceHost polymorphismsParasite densityNitric oxide synthaseLow parasite densitiesIncidence of malariaHigh parasite densitySymptomatic malariaUncomplicated malariaTumor necrosisIncidence rateOxide synthaseHigh incidencePromoter polymorphismGlucose-6-phosphate dehydrogenase AMale hemizygotesMalariaIncidencePreventative measuresGlucose-6-phosphate dehydrogenaseSickle hemoglobinDehydrogenase AMolecular Evaluation of the Natural History of Asymptomatic Parasitemia in Ugandan Children
Nsobya SL, Parikh S, Kironde F, Lubega G, Kamya MR, Rosenthal PJ, Dorsey G. Molecular Evaluation of the Natural History of Asymptomatic Parasitemia in Ugandan Children. The Journal Of Infectious Diseases 2004, 189: 2220-2226. PMID: 15181569, DOI: 10.1086/421281.Peer-Reviewed Original ResearchConceptsSymptomatic malariaPolymerase chain reactionAsymptomatic parasitemiaDetectable parasitemiaNatural historySubsequent clinical malariaClinical malariaAsymptomatic childrenSymptomatic episodesMalarial parasitemiaUgandan childrenPersistent infectionParasitemiaMalariaFirst monthChain reactionMolecular evaluationChildrenHigh ratePrevalenceSimilar ratesMonthsPersistent strainsEpisodesInfection