Browsing by Author "Hang’ombe Bernard Mudenda"

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    Antimicrobial Use Survey and Detection of ESBL-Escherichia coli in Commercial and Medium-/Small-Scale Poultry Farms in Selected Districts of Zambia
    (2024-5-20) Sinyawa Taona; Shawa Misheck; Muuka Geoffrey M.; Goma Fusya; Fandamu Paul; Chizimu Joseph Yamweka; Khumalo Cynthia Sipho; Mulavu Malala; Ngoma Masuzyo; Chambaro Herman Moses; Kamboyi Harvey Kakoma; Kajihara Masahiro; Sawa Hirofumi; Suzuki Yasuhiko; Higashi Hideaki; Mainda Geoffrey; Munyeme Musso; Muma John Bwalya; Nyantakyi Christian Owusu; Egyir Beverly; Hang’ombe Bernard Mudenda
    Antimicrobial resistance (AMR) among Escherichia coli from food animals is a rising problem, and heavy antimicrobial use in poultry is a contributing factor. In Zambia, studies linking poultry-associated AMR and antibiotic use (AMU) are rare. This study aimed to investigate commercial and medium-/small-scale poultry farmers’ usage of antimicrobials based on a questionnaire survey in ten districts of Zambia. In addition, the study characterized extended-spectrum β-lactamase (ESBL)-producing E. coli isolates obtained from poultry in the same districts. Data regarding knowledge and usage of antimicrobials were collected from commercial and medium-/small-scale poultry farmers using a pre-tested structured questionnaire. At the same time, cloacal samples were collected and analyzed. One hundred and fifty E. coli isolates were tested for antimicrobial susceptibility using eight antibiotic classes. The isolates were further screened for ESBL production by streaking them on cefotaxime (CTX)-supplemented MacConkey agar, then subjecting them to sequencing on a NextSeq. The questionnaire survey showed that more medium-/small-scale than commercial poultry farmers used antimicrobials (OR = 7.70, 95% CI = 2.88–20.61) but less prescriptions (OR = 0.02, 95% CI = 0.00–0.08). Susceptibility testing revealed that resistance was highest to ampicillin (128/148, 86.5%) and tetracycline (101/136, 74.3%) and that the prevalence of multidrug resistance (MDR) (28/30, 93.3%) was high. Whole-genome sequencing (WGS) of eight (8/30, 26.7%) isolates with CTX Minimum Inhibitory Concentration (MIC) ≥ 4 µg/mL revealed the presence of ESBL-encoding genes blaCTX-M-14, blaCTX-M-55, and blaTEM. WGS also detected other AMR genes for quinolones, aminoglycosides, phenicols, tetracycline, macrolides, and folate-pathway antagonists. Altogether, the questionnaire survey results showed a higher proportion of AMU and lower prescription usage among medium-/small-scale farmers. In addition, our results emphasize the circulation of ESBL-producing E. coli strains with associated MDR. It is critical to educate farmers about AMR risks and to encourage responsible usage of antimicrobials. Furthermore, there is a need to strengthen regulations limiting access to antimicrobials. Finally, there is a need to establish a one health system to guide public health response.
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    Biosecurity Knowledge, Attitude and Practices in Cage Aquaculture: A Study of Fish Health and Disease Risk Management on Lake Kariba, Siavonga, Zambia
    (2025-5-25) Ndashe Kunda; Changula Katendi; Walubita Nasilele; Miyanda Maiba; Mutanuka Evans; Songe Mwansa M.; Banda Humphrey; Hang’ombe Bernard Mudenda
    Cage aquaculture in Lake Kariba, Zambia, is critical to the region’s fish production but faces significant challenges in disease outbreaks. This study assessed the Knowledge, Attitudes, and Practices (KAP) of aquaculture producers in Siavonga concerning fish health and disease risk management. Data were collected through structured interviews with 14 producers, representing small, medium, and large-scale farms. The study aimed to identify gaps in biosecurity awareness and practices, particularly in relation to disease prevention and control. The results showed that knowledge of biosecurity and disease risks was predominantly low across all farm scales. Specifically, 90% of small-scale producers and 100% of medium-scale producers exhibited low knowledge, while 50% of large-scale producers showed low knowledge. Attitudes toward biosecurity were generally negative, with 90% of small-scale producers holding negative attitudes, compared to 50% of large-scale producers who demonstrated positive attitudes. The implementation of disease management practices was more consistent in medium- and large-scale operations, with 100% of large-scale farms following moderate to good practices, compared to 100% poor practices in small-scale farms. Significant gaps in adherence to best biosecurity practices were observed, particularly in small-scale farms. For instance, 60% of small-scale farms did not follow quarantine procedures, and only 20% assessed disease risks pre-movement. In contrast, 100% of large-scale farms implemented quarantine measures and assessed disease risks before moving fish. This study highlights the need for targeted interventions to improve biosecurity knowledge and practices, especially among small-scale producers, who constitute 71.4% of the respondents. Training, resource allocation, and policy enforcement are crucial to addressing these gaps and mitigating the risk of disease outbreaks that threaten the aquaculture sector’s sustainability in Lake Kariba.