Inclusion Criteria  Quantitative research  Written informed consent Willingness to provide blood sample Fever (≥37.5 C) or history of fever within 24 hours Qualitative research  2.1 Health centre-based evaluation of novel diagnostics  Health centre staff who have received training in the use of the novel diagnostics used in the study Willing and able to give informed consent for participation in the study  2.2 Stakeholder analysis  Adults, male or female, aged 18 years and over Willing and able to give informed consent for participation in the study  Exclusion Criteria  Quantitative research  • Participants requires urgent medical attention  Qualitative research  Identified with intellectual and/or cognitive disability History of or current psychiatric illness