Publications by authors named "Kristen Petros de Guex"

Variable pharmacokinetics of rifampin in tuberculosis (TB) treatment can lead to poor outcomes. Urine spectrophotometry is simpler and more accessible than recommended serum-based drug monitoring, but its optimal efficacy in predicting serum rifampin underexposure in adults with TB remains uncertain. Adult TB patients in New Jersey and Virginia receiving rifampin-containing regimens were enrolled.

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Objective: Latinx people comprise 30% of all new human immunodeficiency virus (HIV) infections in the United States and face many challenges to accessing and engaging with HIV care. To bridge these gaps in care, a Spanish-language mobile health (mHealth) intervention known as ConexionesPositivas (CP) was adapted from an established English-language platform called PositiveLinks (PL) to help improve engagement in care and reduce viral nonsuppression among its users. We aimed to determine how CP can address the challenges that Latinx people with HIV (PWH) in the United States face.

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Objective: Pharmacokinetic variability drives tuberculosis (TB) treatment outcomes but measurement of serum drug concentrations for personalised dosing is inaccessible for children in TB-endemic settings. We compared rifampin urine excretion for prediction of a serum target associated with treatment outcome.

Design: Prospective diagnostic accuracy study.

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Article Synopsis
  • - At least one-third of tuberculosis (TB) cases go undiagnosed, particularly affecting children and adolescents, which complicates efforts to eliminate the disease globally.
  • - A study conducted in rural Tanzania found that children with TB experienced respiratory symptoms for an average of 85 days before receiving treatment, with a significant number coming from households with TB exposure.
  • - Interviews with families revealed that 94% of the 16 families reported TB severely impacted their children's education, highlighting the need for better screening to reduce symptom duration and school absenteeism.
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Distinct from quantifying the economic sequelae of tuberculosis (TB) in adults, data are scarce regarding lived experiences of youth and their caregivers seeking and sustaining TB treatment in low income communities. Children ages 4-17 diagnosed with TB and their caregivers were recruited from rural and semi-urban northern Tanzania. Using a grounded theory approach, a qualitative interview guide was developed, informed by exploratory research.

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Background: Adverse drug reactions (ADRs) frequently occur in patients using second-line anti-tuberculosis medicine for treatment of multidrug resistant tuberculosis (MDR-TB). ADRs contribute to treatment interruptions which can compromise treatment response and risk acquired drug resistance to critical newer drugs such as bedaquiline, while severe ADRs carry considerable morbidity and mortality. N-acetylcysteine (NAC) has shown promise in reducing ADRs for medications related to TB in case series or randomized controlled trials in other medical conditions, yet evidence is lacking in MDR-TB patients.

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The COVID-19 pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an unprecedented event requiring frequent adaptation to changing clinical circumstances. Convalescent immune plasma (CIP) is a promising treatment that can be mobilized rapidly in a pandemic setting. We tested whether administration of SARS-CoV-2 CIP at hospital admission could reduce the rate of ICU transfer or 28-day mortality or alter levels of specific antibody responses before and after CIP infusion.

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Latinx people in the United States are disproportionately diagnosed with HIV and are more likely to experience worse HIV-related health outcomes. Although m-health has demonstrated success in improving HIV care, a gap remains in the development of m-health platforms tailored to Latinx populations. We conducted formative study to guide the adaptation of an evidence-based m-health intervention, PositiveLinks (PL), for Spanish-speaking Latinx people living with HIV (PLWH).

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Rationale: The COVID-19 pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an unprecedented event requiring rapid adaptation to changing clinical circumstances. Convalescent immune plasma (CIP) is a promising treatment that can be mobilized rapidly in a pandemic setting.

Objectives: We tested whether administration of SARS-CoV-2 CIP at hospital admission could reduce the rate of ICU transfer or 28 day mortality.

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Background: Molecular diagnostics have revolutionized the diagnosis of multidrug resistant tuberculosis (MDR-TB). Yet in Tanzania we found delay in diagnosis with more than 70% of MDR-TB patients having a history of several previous treatment courses for TB signaling prior opportunities for diagnosis. We aimed to explore patients' viewpoints and experiences with personal and socio-behavioral obstacles from MDR-TB diagnosis to treatment in an attempt to understand these prior findings.

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Latinx people living with HIV (PLWH) experience disparities in health outcomes and face unique barriers to care related to language, intersectional stigma, and immigration status. We aimed to explore the lived experience of Spanish-speaking Latinx PLWH in the nonurban South to better understand how to improve care for this minority language population. We conducted semistructured interviews with 22 participants (10 men, 10 women, 2 transgender women) who were recruited from a Ryan White HIV/AIDS program (RWHAP) and a community-based organization.

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