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Manock SR, Nsue VU, Olotu A, Mpina M, Nyakarungu E, Raso J, Mtoro A, Ondo Mangue ME, Ntutumu Pasialo BE, Nguema R, Riyahi P, Schindler T, Daubenberger C, Church LWP, Billingsley PF, Richie TL, Abdulla S, Hoffman SL. OUP accepted manuscript. Trans R Soc Trop Med Hyg 2022; 116:745-749. [PMID: 35394038 PMCID: PMC9355999 DOI: 10.1093/trstmh/trac019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/16/2021] [Accepted: 03/12/2022] [Indexed: 11/16/2022] Open
Abstract
Loa loa microfilariae were found on thick blood smears (TBSs) from 8 of 300 (2.7%) residents of Bioko Island, Equatorial Guinea, during a Plasmodium falciparum sporozoite malaria vaccine clinical trial. Only one subject was found to have microfilaraemia on his first exam; parasites were not discovered in the other seven until subsequent TBSs were performed, at times many weeks into the study. All infected individuals were asymptomatic, and were offered treatment with diethylcarbamazine, per national guidelines. L. loa microfilaraemia complicated the enrolment or continued participation of these eight trial subjects, and only one was able to complete all study procedures. If ruling out loiasis is deemed to be important during clinical trials, tests that are more sensitive than TBSs should be performed.
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Affiliation(s)
| | - Vicente Urbano Nsue
- National Malaria Control Program, Ministry of Health and Social Welfare, Malabo, Equatorial Guinea
| | - Ally Olotu
- Department of Interventions & Clinical Trials, Ifakara Health Institute, Box 74, Bagamoyo, Tanzania
- KEMRI Wellcome Trust Research Programme, P.O. Box 230-80108 Kilifi, Kenya
| | - Maximillian Mpina
- Department of Interventions & Clinical Trials, Ifakara Health Institute, Box 74, Bagamoyo, Tanzania
- Department of Medical Parasitology and Infection Biology, Clinical Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland
- University of Basel, Petersplatz 1, 4001 Basel, Switzerland
| | - Elizabeth Nyakarungu
- Department of Interventions & Clinical Trials, Ifakara Health Institute, Box 74, Bagamoyo, Tanzania
| | - José Raso
- National Malaria Control Program, Ministry of Health and Social Welfare, Malabo, Equatorial Guinea
| | - Ali Mtoro
- Department of Interventions & Clinical Trials, Ifakara Health Institute, Box 74, Bagamoyo, Tanzania
| | - Martín Eka Ondo Mangue
- National Malaria Control Program, Ministry of Health and Social Welfare, Malabo, Equatorial Guinea
| | | | - Rufino Nguema
- National Program for Onchocerciasis and Other Filariasis Control, Ministry of Health and Social Welfare, Malabo, Equatorial Guinea
| | | | - Tobias Schindler
- Department of Medical Parasitology and Infection Biology, Clinical Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland
- University of Basel, Petersplatz 1, 4001 Basel, Switzerland
| | - Claudia Daubenberger
- Department of Medical Parasitology and Infection Biology, Clinical Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland
- University of Basel, Petersplatz 1, 4001 Basel, Switzerland
| | | | | | | | - Salim Abdulla
- Department of Interventions & Clinical Trials, Ifakara Health Institute, Box 74, Bagamoyo, Tanzania
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