Publications by authors named "Roma Chilengi"

Accurate cause-of-death statistics are vital for public health policy, but less than one-third of deaths globally are assigned a cause. Verbal autopsy (VA) methods are crucial in low- and middle-income countries lacking complete civil registration and vital statistics (CRVS) systems. We explored VA implementation in Zambia by using a previously developed framework.

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Background: Antimicrobial stewardship programmes (ASPs) aim to optimize antibiotic use and prevent antimicrobial resistance.

Objective: This study assessed the impact of ASPs, initiated using a hub-and-spoke approach, on antibiotic use in Zambian public hospitals.

Methods: A pre-post study was conducted in 10 ASP-naive hospitals across Zambia using the Centers for Disease Control and Prevention (CDC)'s hospital-based ASP core elements (i.

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Background: Antimicrobial stewardship (AMS) programs are critical in combating antimicrobial resistance (AMR). In Zambia, there is little information regarding the capacity of hospitals to establish and implement AMS programs. The objective of this study was to conduct a baseline assessment of WHO core elements for an AMS program implementation in eight hospitals in Zambia.

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Background: The number of COVID-19 deaths reported in Zambia (N = 4069) is most likely an underestimate due to limited testing, incomplete death registration and inability to account for indirect deaths due to socioeconomic disruption during the pandemic. We sought to assess excess mortality during the COVID-19 pandemic in Zambia.

Methods: We conducted a retrospective analysis of monthly-death-counts (2017-2022) and individual-daily-deaths (2020-2022) of all reported health facility and community deaths at district referral health facility mortuaries in 12 districts in Zambia.

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Antimicrobial resistance (AMR) is a public health problem exacerbated by the overuse and misuse of antibiotics and the inadequate capacity of laboratories to conduct AMR surveillance. This study assessed the capacity of laboratories in seven faith-based hospitals to conduct AMR testing and surveillance in Zambia. This multi-facility, cross-sectional exploratory study was conducted from February 2024 to April 2024.

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Wastewater-based surveillance has emerged as an important method for monitoring the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). This study investigated the presence of SARS-CoV-2 in wastewater in Zambia. We conducted a longitudinal study in the Copperbelt and Eastern provinces of Zambia from October 2023 to December 2023 during which 155 wastewater samples were collected.

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There are growing concerns about the comeback of vaccine-preventable diseases. Epidemics exert shocks which affect other health performance indicators such as routine immunizations. Early model forecasts indicate decreased use of immunization services, which puts children at greater risk.

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Objectives: Pandemic response in low-income countries (LICs) or settings often suffers from scarce epidemic surveillance and constrained mitigation capacity. The drivers of pandemic burden in such settings, and the impact of limited and delayed interventions remain poorly understood.

Methods: We analysed COVID-19 seroprevalence and all-cause excess deaths data from the peri-urban district of Kabwe, Zambia between March 2020 and September 2021 with a novel mathematical model.

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Article Synopsis
  • - The study aimed to compare the risks of preterm birth (PTB) and small for gestational age (SGA) in pregnant women with HIV versus those without, while also looking at maternal immune activation and the timing of antiretroviral therapy (cART).
  • - Conducted in Lusaka, Zambia, the study enrolled 1481 women with singleton pregnancies and found that HIV infection increased the risk of PTB (adjusted odds ratio of 1.60) and SGA (1.29); cART started after conception was linked to even greater risks.
  • - The findings suggest that maternal HIV is a significant factor for PTB, with women starting cART during pregnancy facing the highest risks, indicating
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Article Synopsis
  • Mutations in SARS-CoV-2 have led to the emergence of new variants with potential effects like increased spread, severity, and vaccine resistance.
  • A cross-sectional study in Zambia analyzed 76 SARS-CoV-2 samples from November 2021 to February 2022, identifying 4,097 mutations, with 1,925 occurring in the spike protein.
  • The study found 83 unique amino acid mutations in the spike proteins of various Omicron sublineages, emphasizing the need for ongoing monitoring and pandemic readiness.
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Article Synopsis
  • Enteric infections from viral pathogens like rotavirus and adenovirus are a significant public health issue, prompting the need for effective surveillance systems in wastewater to identify risk areas.
  • In Zambia, researchers tested wastewater samples using different methods to concentrate viruses, resulting in a high detection rate (90% for HAdV and 70% for RVA) through molecular techniques.
  • The study concluded that certain concentration methods, particularly skimmed milk flocculation and bag-mediated filtration, could be beneficial for ongoing surveillance in resource-limited settings, highlighting the importance of monitoring these pathogens in the community.
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Childhood stunting is associated with impaired cognitive development and increased risk of infections, morbidity, and mortality. The composition of the enteric microbiota may contribute to the pathogenesis of stunting. We systematically reviewed and synthesized data from studies using high-throughput genomic sequencing methods to characterize the gut microbiome in stunted versus non-stunted children under 5 years in LMICs.

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Background: Antimicrobial resistance (AMR) poses a threat to public health globally. Despite its consequences, there is little information about the knowledge, awareness, and practices towards AMR among healthcare workers (HCWs). Therefore, this study assessed the knowledge, awareness and practices regarding antimicrobial use (AMU), AMR and antimicrobial stewardship (AMS) among HCWs who are involved in the implementation of AMS activities across eight hospitals in Zambia.

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Introduction: There have been few empirical studies for diagnostic test accuracy of syphilis using a sequence of rapid tests in populations with low prevalence of syphilis such as pregnant women. This analysis describes syphilis test positivity frequency among pregnant women at an antenatal clinic in Zambia using a reverse-sequence testing algorithm for antenatal syphilis screening.

Methods: Between August 2019 and May 2023, we recruited 1510 pregnant women from a peri-urban hospital in Lusaka, Zambia.

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Deaths from COVID-19 likely exceeded official statistics in Zambia because of limited testing and incomplete death registration. We describe a sentinel COVID-19 mortality surveillance system in Lusaka, Zambia. We analyzed surveillance data on deceased persons of all ages undergoing verbal autopsy (VA) and COVID-19 testing at the University Teaching Hospital (UTH) mortuary in Lusaka, Zambia, from April 2020 through August 2021.

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Article Synopsis
  • Oral rotavirus vaccines show reduced effectiveness in low-income areas where early childhood human cytomegalovirus (HCMV) infections are common, potentially affecting immune responses.
  • A study measured antibodies in vaccinated infants, finding no overall link between HCMV infection status and rotavirus antibody levels; however, HIV-exposed-uninfected infants with HCMV showed significantly lower antibody responses.
  • The findings suggest that while HCMV may not broadly impact rotavirus vaccine responses in all infants, its effects on vulnerable groups like HIV-exposed infants warrant further investigation for improving vaccine effectiveness.
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Diarrhoeagenic (DEC) significantly contributes to the burden of diarrhoea among children. Currently, there is no approved vaccine against DEC, but several vaccines against the enterotoxigenic (ETEC) pathotype are in advanced clinical trial stages, including the ETVAX vaccine, undergoing evaluation in Zambia. This study reports on the reactivity of antibodies from ETVAX vaccine and placebo recipients in a phase I clinical trial to proteins derived from (DEC) other than ETEC.

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Objectives: This study assessed antibiotic prescribing patterns in primary healthcare facilities and antimicrobial resistance (AMR) profiles of commensal and enterococci isolated from pregnant women and children under 5 years of age.

Materials And Methods: This cross-sectional study was conducted in Lusaka and Ndola districts of Zambia. Prescription pattern data were obtained from hospital pharmacies.

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Article Synopsis
  • The study investigates rotavirus infections in fully vaccinated children in Zambia, highlighting the emergence of genetically altered viruses that can evade immunity from existing vaccines.
  • Researchers conducted whole genome sequencing on diarrheal stool samples and identified several RVA strains, including mono and multiple reassortant strains, which exhibited differences in antigenic epitope compared to the common vaccine strain, Rotarix.
  • Results suggest that these genetic variations may help the virus escape neutralizing antibodies, indicating a need for improved vaccination strategies and the development of more effective universal rotavirus vaccines.
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Article Synopsis
  • - The study evaluated the effectiveness of COVID-19 vaccines in preventing symptomatic COVID-19 among healthcare workers (HCWs) in Zambia from May 2021 to March 2022, focusing on those with a complete vaccination schedule.
  • - Researchers included 1,767 HCWs, with 282 fully vaccinated participants, and found that vaccine effectiveness (VE) was 72.7% overall, and higher during the Delta variant period (79.4%) compared to the Omicron period (37.5%).
  • - The findings concluded that COVID-19 vaccines were effective in reducing symptomatic SARS-CoV-2 cases when the Delta variant was prevalent, but were less effective during the Omicron variant period.
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