Marc Sam Opollo

Dr. Marc Sam Opollo

Lira University, Uganda
orcid

Research Focus & Metrics

Academic Career Length

20Years (2007-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Journal Article
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MOMarc Sam Opollo
Marc Sam Opollo
TOTom Charles Otim
Tom Charles Otim
WKWalter Kizito
Walter Kizito
PTPruthu Thekkur
Pruthu Thekkur
AKAjay Kumar
Ajay Kumar
MZMaria Zolfo
Maria Zolfo
Globally, 5–15% of hospitalized patients acquire infections (often caused by antimicrobial-resistant microbes) due to inadequate infection prevention and control (IPC) measures. We used the World Health Organization’s (WHO) ‘Infection Prevention and Control Assessment Framework’ (IPCAF) tool to assess the IPC compliance at Lira University hospital (LUH), a teaching hospital in Uganda. We also characterized challenges in completing the tool. This was a hospital-based, cross-sectional study conducted in November 2020. The IPC focal person at LUH completed the WHO IPCAF tool. Responses were validated, scored, and interpreted per WHO guidelines. The overall IPC compliance score at LUH was 225/800 (28.5%), implying a basic IPC compliance level. There was no IPC committee, no IPC team, and no budgets. Training was rarely or never conducted. There was no surveillance system and no monitoring/audit of IPC activities. Bed capacity, water, electricity, and disposal of hospital waste were adequate. Disposables and personal protective equipment were not available in appropriate quantities. Major challenges in completing the IPCAF tool were related to the detailed questions requiring repeated consultation with other hospital stakeholders and the long time it took to complete the tool. IPC compliance at LUH was not optimal. The gaps identified need to be addressed urgently.

17 September 2007 in Vaccine
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Journal Article
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MEMichael Eller
Michael Eller
LELeigh Anne Eller
Leigh Anne Eller
MOMarc Sam Opollo
Marc Sam Opollo
BOBenson J. Ouma
Benson J. Ouma
POPeter O. Oballah
Peter O. Oballah
JCJosephine H. Cox
Josephine H. Cox

17 November 2014 in The Journal of Infectious Diseases
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Journal Article
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MEMichael Eller
Michael Eller
MOMarc Sam Opollo
Marc Sam Opollo
MLMichelle Liu
Michelle Liu
ARAndrew D. Redd
Andrew D. Redd
LELeigh Anne Eller
Leigh Anne Eller
MRMerlin L. Robb
Merlin L. Robb
Background. Untreated human immunodeficiency virus type 1 (HIV) infection is associated with persistent immune activation, which is an independent driver of disease progression in European and United States cohorts. In Uganda, HIV-1 subtypes A and D and recombinant AD viruses predominate and exhibit differential rates of disease progression. Methods. HIV-1 seroconverters (n = 156) from rural Uganda were evaluated to assess the effects of T-cell activation, viral load, and viral subtype on disease progression during clinical follow-up. Results. The frequency of activated T cells was increased in HIV-1–infected Ugandans, compared with community matched uninfected individuals, but did not differ significantly between viral subtypes. Higher HIV-1 load, subtype D, older age, and high T-cell activation levels were associated with faster disease progression to AIDS or death. In a multivariate Cox regression analysis, HIV-1 load was the strongest predictor of progression, with subtype also contributing. T-cell activation did not emerge an independent predictor of disease progression from this particular cohort. Conclusions. These findings suggest that the independent contribution of T-cell activation on morbidity and mortality observed in European and North American cohorts may not be directly translated to the HIV epidemic in East Africa. In this setting, HIV-1 load appears to be the primary determinant of disease progression.

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RKRogers Kisame
Rogers Kisame
RNRobinah Najjemba
Robinah Najjemba
JGJohan Van Griensven
Johan Van Griensven
FKFreddy Kitutu
Freddy Kitutu
KTKudakwashe Takarinda
Kudakwashe Takarinda
MLMohammed Lamorde
Mohammed Lamorde
Blood culture (BC) processes are critical to the utility of diagnostic testing, bloodstream infection (BSI) management, and antimicrobial resistance (AMR) surveillance. While Uganda has established BC guidelines, often laboratory practice does not meet the desired standards. This compromises pathogen recovery, reliability of antimicrobial susceptibility testing, and diagnostic test utility. This study assessed laboratory BC process outcomes among non-malarial febrile children below five years of age at five AMR surveillance sites in Uganda between 2017 and 2018. Secondary BC testing data was reviewed against established standards. Overall, 959 BC specimens were processed. Of these, 91% were from female patients, neonates, infants, and young children (1–48 months). A total of 37 AMR priority pathogens were identified; Staphylococcus aureus was predominant (54%), followed by Escherichia coli (19%). The diagnostic yield was low (4.9%). Only 6.3% of isolates were identified. AST was performed on 70% (18/26) of identified AMR priority isolates, and only 40% of these tests adhered to recommended standards. Interventions are needed to improve laboratory BC practices for effective patient management through targeted antimicrobial therapy and AMR surveillance in Uganda. Further research on process documentation, diagnostic yield, and a review of patient outcomes for all hospitalized febrile patients is needed.

12 October 2022 in PLOS Global Public Health
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POPhilip Orishaba
Philip Orishaba
MOMarc Sam Opollo
Marc Sam Opollo
CNChristine Nalwadda
Christine Nalwadda
AMAllan Muruta
Allan Muruta
IMIssa Makumbi
Issa Makumbi
GBGodfrey Bwire
Godfrey Bwire
Introduction: On 21st March 2020, the first COVID-19 case was detected in Uganda and a COVID-19 pandemic declared. On the same date, a nationwide lockdown was instituted in response to the pandemic. Subsequently, more cases were detected amongst the returning international travelers as the disease continued to spread across the country. On May 14th, 2020, a cholera epidemic was confirmed in Moroto district at a time when the district had registered several COVID-19 cases and was in lockdown. This study aimed to describe the cholera epidemic and response activities during the COVID-19 pandemic as well as the hurdles and opportunities for cholera control encountered during the response. Materials and methods: In a cross-sectional study design, we reviewed Moroto district’s weekly epidemiological records on cholera and COVID-19 from April to July 2020. We obtained additional information through a review of the outbreak investigation and control reports. Data were analyzed and presented in frequencies, proportions, attack rates, case fatality rates, graphs, and maps. Results: As of June 28th, 2020, 458 cases presenting with severe diarrhea and/or vomiting were line listed in Moroto district. The most affected age group was 15–30 years, 30.1% (138/458). The females, 59.0% [270/458], were the majority. The Case Fatality Rate (CFR) was 0.4% (2/458). Whereas home use of contaminated water following the vandalization of the only clean water source in Natapar Kocuc village, Moroto district, could have elicited the epidemic, implementing COVID-19 preventive and control measures presented some hurdles and opportunities for cholera control. The significant hurdles were observing the COVID-19 control measures such as social distancing, wearing of masks, and limited time in the community due to the need to observe curfew rules starting at 6.00 pm. The opportunities from COVID-19 measures complementary to cholera control measures included frequent hand washing, travel restrictions within the district & surrounding areas, and closure of markets. Conclusion: COVID-19 preventive and control measures such as social distancing, wearing of masks, and curfew rules may be a hurdle to cholera control whereas frequent hand washing, travel restrictions within the district & surrounding areas, and closure of markets may present opportunities for cholera control. Other settings experiencing concurrent cholera and COVID-19 outbreaks can borrow lessons from this study.

12 June 2025 in PLOS ONE
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Journal Article
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DMDerick Modi
Derick Modi
MMMarvin Musinguzi
Marvin Musinguzi
PPPatricia Pita
Patricia Pita
EKEustes Kigongo
Eustes Kigongo
AKAmir Kabunga
Amir Kabunga
MOMarc Sam Opollo
Marc Sam Opollo
Background: Malaria poses a substantial global challenge and continues to be a major cause of mortality and morbidity in numerous developing nations. Children under the age of five in low- and middle-income countries such as Uganda are the most affected. However, there remains a deficiency in knowledge regarding recurrent malaria episodes in Uganda. We determined the prevalence and factors associated with recurrent malaria episodes among children under five at Kayunga Regional Referral Hospital. Methodology: This was a cross-sectional study conducted among children under five at Kayunga Regional Referral Hospital in central Uganda. The data was collected among 250 consecutively sampled participants who were caring for children under five. Data was collected using a researcher-administered questionnaire and analyzed at univariate, bivariate, and multivariate levels. Results: A total of 250 participants participated in the study with a response rate of 98.45%. The prevalence of recurrent malaria episodes was 84% (210). The factors significantly associated with recurrent malaria episodes were; children from houses that were annually sprayed (aOR; 8.93, 95%CI,2.11–37.81), children from houses that were not sprayed (aOR; 3.80,95%CI,1.27–9.41, p = 0.017), children who were treated with quinine antimalarial in the previous infection (aOR, 0.28, 95%CI,0.12–0.65) and children who were residing in a house whose windows were closed at 7–8 pm (aOR, 8.31, 95%CI, 2.21–10.27). Conclusion: The recurrence of malaria episodes among children under five is significantly high, suggesting the possibility of malaria resistance. Importantly, quinine remains a robust alternative treatment for complicated malaria, owing to its significant efficacy against malaria parasites in regions of moderate to high transmission rates. Malaria prevention programs should consider biannual indoor residual spraying in high malaria transmission areas using vector-susceptible insecticides.