Publications by authors named "Joseph Jarvis"

Background: The role of computed tomography (CT) before lumbar puncture (LP) is unclear, with limited evidence for a causal link between LP and cerebral herniation or for the ability of CT to identify individuals at risk of herniation. The risks of LP delay or deferral are potentially greater in high-HIV prevalence, resource-limited settings; we analyzed data from such a setting to determine the impact of CT on time to LP and treatment, as well as mortality.

Methods: Adults with suspected central nervous system (CNS) infection were enrolled prospectively into the Botswana National Meningitis Survey between 2016 and 2019.

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  • Tuberculous meningitis (TBM) is a major health issue in Botswana, especially linked to high HIV rates, and prior to 2016, TB testing was limited to mycobacterial cultures, making diagnosis difficult.
  • The introduction of the GeneXpert platform significantly improved TB-specific investigations in cerebrospinal fluid samples, increasing from 4.5% to 29% from 2016 to 2022, as access to testing became more widespread.
  • Despite a decline in total CSF samples analyzed, the proportion of microbiologically confirmed TBM cases rose slightly, indicating that better testing methods are leading to more accurate diagnoses in remote healthcare settings.
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Unlabelled: Cryptococcal meningitis causes an estimated 112,000 global deaths per annum. Genomic and phenotypic features of the infecting strain of spp. have been associated with outcomes from cryptococcal meningitis.

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Background: In 2022, the World Health Organization (WHO) recommended a single 10mg/kg dose of liposomal amphotericin B in combination with 14 days of flucytosine and fluconazole (AMBITION-cm regimen) for induction therapy of HIV-associated cryptococcal meningitis, based on the results of the multisite AMBITION-cm trial. We evaluated outcomes after real-world implementation of this novel regimen in Uganda.

Methods: We enrolled Ugandan adults with cryptococcal meningitis into an observational cohort receiving the AMBITION-cm regimen with therapeutic lumbar punctures in routine care during 2022-2023.

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Cryptococcus neoformans, Cryptococcus gattii and Candida albicans are opportunistic fungal pathogens associated with infections in immunocompromised hosts. Cryptococcal meningitis (CM) is the leading fungal cause of HIV-related deaths globally, with the majority occurring in Africa. The human immune response to C.

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Amphotericin B has long been crucial for treating many serious infectious diseases, such as invasive fungal infections and visceral leishmaniasis, particularly for patients who are immunocompromised, including those with advanced HIV infection. The conventional amphotericin B deoxycholate formulation has largely been replaced in high-income countries with liposomal amphotericin B (LAmB), which has many advantages, including lower rates of adverse events, such as nephrotoxicity and anaemia. Despite an evident need for LAmB in low-income and middle-income countries, where mortality from invasive fungal infections is still substantial, many low-income and middle-income countries still often use the amphotericin B deoxycholate formulation because of a small number of generic formulations and the high price of the originator LAmB.

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  • There is currently no fast and accurate test for diagnosing tuberculous meningitis (TBM), which often delays treatment; this study aimed to create a better diagnostic tool by using a variety of data from past studies across different populations.* -
  • The research involved 3,761 participants from 14 studies, identifying key predictive factors like cerebrospinal fluid glucose and HIV status, and analyzed the data using techniques like logistic regression and random forest regression.* -
  • The resulting mobile app for TBM diagnosis shows promising accuracy, with further validation needed to confirm its effectiveness in diverse clinical settings.*
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  • Chronic HIV disease significantly increases the risk of albuminuria, particularly outside sub-Saharan Africa, but data specific to sub-Saharan populations is limited.
  • A study conducted in Gaborone, Botswana, assessed 1533 adults living with HIV and found an overall albuminuria prevalence of 20.7%, with a higher occurrence in males (25%) compared to females (16.4%).
  • Predictors of albuminuria varied between sexes, highlighting the need for larger studies to understand the long-term effects of albuminuria in people living with HIV, particularly focusing on gender differences.
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  • The IMPROVE trial aims to improve outcomes for adults suffering from HIV-associated cryptococcal meningitis by testing two TPT strategies for preventing tuberculosis (TB).
  • The study will enroll 205 participants in Uganda, who will be randomized to receive either early inpatient or standard outpatient initiation of a one-month TB treatment regimen.
  • The trial will assess the safety, feasibility, and treatment completion rates, with a focus on gathering data that could enhance TB prevention methods in high-risk populations.
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Introduction: Central nervous system infections (CNSI) disproportionately affect individuals in low-resource settings where diagnosis is challenging; large proportions of patients never receive a confirmed microbiological diagnosis resulting in inadequate management and high mortality. The epidemiology of CNSI varies globally and conventional diagnostics deployed in resource-limited settings have significant limitations, with an urgent need for improved diagnostic strategies.

Areas Covered: This review describes molecular platforms and other novel diagnostics used in the diagnosis of CNSI that are applicable to resource-limited settings.

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Cryptococcosis is a major worldwide disseminated invasive fungal infection. Cryptococcosis, particularly in its most lethal manifestation of cryptococcal meningitis, accounts for substantial mortality and morbidity. The breadth of the clinical cryptococcosis syndromes, the different patient types at-risk and affected, and the vastly disparate resource settings where clinicians practice pose a complex array of challenges.

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  • HIV-associated cryptococcal meningitis is a major cause of AIDS deaths, prompting research to establish a faster method for detecting fungal load, which traditionally relies on CFU counts.
  • The study developed qPCR assays to identify and quantify different Cryptococcus species in cerebrospinal fluid from patients in sub-Saharan Africa, analyzing samples at various stages of antifungal treatment.
  • Results showed high sensitivity in detecting fungal load and identified a significant prevalence of Cryptococcus neoformans in both Botswana and Malawi, with some patients showing viable but non-culturable yeasts after treatment.
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Background: Cryptococcal meningitis (CM) causes substantial mortality in African countries with a high prevalence of human immunodeficiency virus (HIV), despite advances in disease management and increasing antiretroviral therapy (ART) coverage. Reliable diagnosis of CM is cheap and more accessible than other indicators of advanced HIV disease burden such as CD4 testing or investigation for disseminated tuberculosis; therefore, monitoring CM incidence has the potential to serve as a valuable metric of HIV programmatic success.

Methods: Botswana national meningitis surveillance data from 2015 to 2022 were obtained from electronic health records.

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HIV-associated cryptococcal meningitis remains a key driver of AIDS-related mortality. Mortality is twice as high in those who present later to care and with severe symptoms such as confusion. We embedded a qualitative methods study within a randomised controlled trial in Gaborone, Botswana and Kampala, Uganda with the aim of understanding pathways to care.

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In a population-based representative sample of adults residing in 22 communities in Botswana, a southern African country with high HIV prevalence, 1 in 4 individuals had high blood pressure. High blood pressure was less prevalent in adults with HIV than without HIV. Sixty percent of persons with high blood pressure had not previously been diagnosed.

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  • Adults with HIV-associated cryptococcal meningitis frequently have concurrent infections with cytomegalovirus (CMV) and tuberculosis (TB), which can complicate their health outcomes.
  • A study of 497 Ugandan patients revealed that 42% either developed TB or died within a median follow-up of 4.6 months, with a notable risk increase linked to high levels of CMV viremia at diagnosis.
  • Specifically, participants with high CMV viremia (≥1000 IU/mL) were more than twice as likely to experience TB or death compared to those with lower or no detectable CMV levels.
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  • The study highlights the increasing incidence of cryptococcosis among HIV-negative individuals and aims to evaluate the effectiveness of the IMMY CrAg test for diagnosing this condition in those populations.
  • A systematic review of literature revealed that the IMMY CrAg LFA test has a high pooled sensitivity (96% for serum and 99% for cerebrospinal fluid) and specificity (96% for serum and 99% for CSF) in HIV-negative patients.
  • The authors conclude that while the test shows promising diagnostic performance akin to results in HIV-positive individuals, further research with more studies is necessary to confirm its clinical value in HIV-negative populations.
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Background: There are limited data describing clinical flucytosine pharmacokinetics (PK). The variability of flucytosine partitioning into the CNS is not known. We described the interindividual variability in flucytosine PK in patients with HIV-associated cryptococcal meningoencephalitis.

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Background: Research into life-threatening illnesses which require emergency hospitalisation is essential. This group of patients is unique in that they are experiencing an unfolding emergency when they are approached, enrolled, and followed up in a research study. We aimed to synthesise qualitative data from trial participants and surrogate decision-makers to deepen our understanding and inform the design and conduct of future clinical trials for life-threatening illnesses.

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Background: Fungal infections are common causes of death and morbidity in those with advanced HIV infection. Data on access to diagnostic tests in Africa are scarce. We aimed to evaluate the diagnostic capacity for invasive fungal infections in advanced HIV disease in Africa.

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