Isolation and characterization of Listeria monocytogenes among women attending Jimma University medical center, Southwest Ethiopia

Abstract

Background: Listeria monocytogenes (LM) has come to be a major public health issue of at-risk groups, causing high morbidity and mortality. Despite this data, studies are very limited in developing countries like Ethiopia. Thus, we aimed to isolate and characterize LM in terms of antibiogram and biofilm formation among pregnant women with fever, women with a history of spontaneous abortion, women with a history of fetal loss, and women with preterm delivery at Jimma University Medical Center (JUMC), southwest Ethiopia. Methods: A cross-sectional study was done among 144 women from June to August 2019. Isolates were tested for antibiotic susceptibility and biofilm formation using disc diffusion and microtiter plate method, respectively. Data were collected using a structured questionnaire, entered into Epidata 3.1 and logistic regression was done by SPSS v25.0. Results: LM was isolated in 8 (5.56%) of 144 screened women. The isolation rate of LM was relatively higher among women with a history of fetal loss (9.7%), followed by women with preterm delivery (6.25%). One of the six cord blood was positive for LM, indicating that the transplacental transmission rate at JUMC was 16.7%. More than 2% of women with an ongoing pregnancy were found to have LM septicemia, which could hurt their fetus. All of the isolates tested were susceptible to Ampicillin. However, all of the isolates were resistant to Penicillin and Meropenem and were biofilm producers. Conclusions: The high magnitude of pregnancy-related listeriosis in the current study setting appears that implementation of educational programs targeting risk reduction and more studies to identify sources of LM are warranted. The choice of antibiotics should be after susceptibility testing.