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Laboratory indices of hospitalized sickle cell disease patients, prevalence and antimicrobial susceptibility of pathogenic bacterial isolates at MRCG ward in the Gambia.

BACKGROUND: The aim of this study was to determine the prevalence of invasive bacterial infections and their antimicrobial resistance patterns in sickle cell disease (SCD) patients admitted at the Medical Research Council the Gambia (MRCG) Ward in the era of PCV and Hib vaccination in the Gambia.

METHODS AND RESULTS: This study was conducted in the clinical laboratory department of MRCG. We retrospectively generated haematological, and blood culture data from our electronic medical records from 2015 to 2022 of SCD patients admitted to MRCG Ward. Of 380 SCD patients, blood culture was requested only for 159. Of the 159 admitted SCD, 11 patients had qualified positive blood cultures. Five different types of bacterial pathogens were isolated from these positive blood cultures: 4 Staphylococcus aureus, 3 Streptococcus pneumoniae, 2 Salmonella species, 1 Enterococcus species, and 1 Shigella boydii. No episode of bacteremia caused by Haemophilus influenzae type b was identified. The molecular serotyping of the Streptococcus pneumoniae isolates revealed non-vaccine serotypes 10 A, 12 F and 12 F. Penicillin resistance was recorded in two of the three Streptococcus pneumoniae. The Staphylococcus aureus isolates were penicillin resistant but cefoxitin sensitive, hence no methicillin (oxacillin) resistant Staphylococcus aureus was reported. Generally, the isolated pathogens were all sensitive to chloramphenicol, and vancomycin. The haematological indices were not significantly varied between SCD patients with and without microbiologically confirmed bacterial infection.

CONCLUSION: Streptococcus pneumoniae and Staphylococcus aureus were the most common cause of bacteremia in these admitted SCD patients. The presence of non-typhoidal Salmonella and Shigella infection coupled with penicillin resistance should be considered during penicillin prophylaxis and empirical treatment regimens for SCD patients and future SCD management policies in the Gambia. The haematological parameters may not be reliable biomarkers in differentiating bacterial from non-bacterial infections in SCD patients.

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