Abstract
More than one million neonatal deaths occur every year worldwide, of which 99% take place in low-income countries. In Rwanda, nearly 71% of neonatal deaths are preventable and among these, 10% are due to neonatal sepsis. Nevertheless, limited information exists on neonatal sepsis and its associated factors in Rwanda. The objectives of the study were to find prevalence and factors associated with neonatal sepsis among neonates admitted in Kibungo Referral Hospital, Ngoma District, Rwanda. We used a retrospective cross-sectional study design reviewing a subset of neonatal, maternal and laboratory records from Kibungo Hospital in 2017. Data were reviewed and collected from March to May, 2018. Logistic regression and odds ratios were calculated to identify the factors associated with neonatal sepsis at 95% CI, p < 0.05. Of the 972 total neonates’ medical records from 2017, we randomly selected 422 of which 12.8% (n = 54) had neonatal sepsis. When blood cultures were positive, 62% grew Klebsiella pneumoniae. Among neonates with sepsis, 38 (70%) recovered while 16 (30%) died. Neonatal sepsis was strongly associated with neonatal age less than or equal to three days (aOR: 2.769, 95% CI 1.312–5.843; p = 0.008); and gestational age less than 37 weeks (aOR: 4.149; CI 1.1878–9.167; p ≤ 0.001). Increased use of blood cultures including sensitivity testing, routine surface cultures of the neonatology and maternity wards facilities, and systematic ward cleaning are all important approaches to prevent and treat neonatal infections in additional to regular neonatal sepsis evaluations.
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Introduction
Neonatal sepsis remains a public health concern worldwide. More than one million neonatal deaths occur per year, with 99% occurring in low- and middle-income countries1,2,3. The global neonatal mortality rate has decreased over the past years, but to a lesser extent compared to other under-five child deaths4. Globally, an estimate of 22, 25 and 34% of under-five deaths resulted from neonatal infections, intrapartum related conditions and preterm birth complications respectively, with highest mortality rates being reported in Sub-Saharan Africa5. Neonatal deaths account for 68% of under-five deaths in Rwanda6. Rural hospitals mainly serve the poor community, and have limited resources for controlling infectious diseases which might increase the risks of developing sepsis. However, proper management of neonatal sepsis can improve patient outcomes7,8,9,10,11,12.
Neonatal sepsis is defined as bloodstream infection resulting from bacterial, viral and or fungal pathogens occurring within 28 days after birth13. It is subcategorized as early and late onset sepsis, occurring before and after 72 h of life, respectively14,15,16,17. Early-onset sepsis is typically due to the pathogens acquired during peripartum period, prior to or during childbirth18. Late onset sepsis is generally due to hospital acquired infections after birth19,20,21,22, and unenforced infection prevention and control in the Hospital settings23,24,25,26,27. The 72-h cut-off point was selected for this study due to the wide range review of most recent articles28,29,30. Laboratory evaluations of neonatal sepsis include an elevated or depressed white blood cell count with a left shifted differential count, an elevated C-Reactive Protein, and a positive blood culture31,32. However, the blood culture which is the gold standard in sepsis confirmation, is not routinely available in low-income countries1,33.
Neonatal sepsis prevalence is between 1 and 10 per 1,000 live births in developed countries but increases threefold in low-income countries. The prevalence of early and late onset neonatal sepsis varies by region. For example, the incidence of neonatal mortality was higher in rural than in urban settings in Senegal and in Kenya34,35. Factors reported to be associated with sepsis also vary by region and include young maternal age, poor access to antenatal care, post-natal age of neonate, low birth weight, and birth asphyxia36,37,38,39,40,41. The neonatal mortality rate is high in Rwanda at 19 out of 1,000 live births according to the 2019–2020 Rwanda Demographic Health Survey (RDHS)36. About 71% of neonatal deaths in Rwanda are preventable and neonatal sepsis accounts for 10% of total preventable causes; and along with sepsis, asphyxia and complications of prematurity are among the leading causes of neonatal deaths in Rwanda42.
Only a few studies on neonatal sepsis have been conducted in Rwanda, and most of them focused on the urban setting43,44,45. Kibungo is a rural referral hospital located approximately 100 km from Kigali. It is the main referral facility for 12 health centers in its catchment area with only one neonatology unit serving about 85 neonates monthly. To our knowledge, paucity of studies has been conducted to assess risk factors associated with neonatal sepsis among neonates admitted in Ngoma District. This study aimed to determine the prevalence and factors associated with neonatal sepsis among neonates admitted in Kibungo Referral Hospital, Ngoma District of Rwanda.
Methods
Study design and setting
This retrospective, cross-sectional study reviewed the medical records of all neonates admitted at Kibungo Hospital, Ngoma District, Eastern Province, Rwanda from January-December 2017. Kibungo Hospital has a 312 bed capacity including 24 beds in the Neonatology ward. Kibungo Hospital Neonatology services include Neonatology Intensive Care (Unit) and Kangaroo mother care. Patients are cared for by a multidisciplinary team comprised by Pediatricians, General practitioners(GPs) and Nurses.
Study population and sample size
Of the 972 neonatal medical records at Kibungo Hospital from 2017, we collected neonatal and maternal data from a random sample of 422. We also collected all environmental laboratory cultures sent from the neonatology and maternity wards during 2017.
Data collection and procedures
Clinical data including neonatal and maternal characteristics were extracted from neonatal files. Environment swabbing culture results were collected from laboratory records. A Microsoft Excel data collection tool was developed to record neonatal, maternal and ward environmental data. Data collection was conducted in a three-month period from March to May, 2018.
Maternal data were: age, fever > 38 °C, number of previous pregnancies, place of delivery, educational level, employment status, health insurance, obstructed labor, premature rupture of membrane (PROM), foul smelling amniotic fluid. Neonatal data were: post-natal age, sex; birth weight; mode of delivery; place of birth; birth asphyxia (yes/no); gestational age in weeks; Apgar score at 10 min; resuscitation after birth (yes/no); sepsis (yes/no), and if yes, time of onset, bacterial isolate, and sepsis outcome (died or recovered). The determination of sepsis was relied on physicians’ classification of whether the neonate had sepsis as final diagnosis.
The environment cultures data were gathered from laboratory records. Laboratory records were reviewed to collect information related to environmental samples collected for bacteriological cultures, sample sources and identified bacteria species.
Data analysis
Stata Statistical Software was used for analysis: version 13. College Station, TX: Stata Corp LP https://www.stata.com/. Descriptive statistics, including frequencies and percentages, were calculated to characterize the study population in terms of socio-demographic and other relevant variables. Analytical statistics were performed for bivariate and multivariable logistic regression. For the bivariate logistic regression, the association between independent and dependent variables was found at 95% confidence interval with p value < 0.05. Multivariable logistic regression was done for the variables that showed significant association at the bivariate analysis, and p value ≤ 0.05 was considered statistically significant.
Ethical approval
The study obtained ethical approval from the ethical committee of Kibungo Referral Hospital with a reference letter (Ref No:14/117/RJ/H1-1/2/2018). And all data were collected in accordance with all relevant guidelines and in the Declaration of Helsinki46. The secondary data from a programmatic management health system were used hence the informed consent and assent were waived by the ethical committee of Kibungo Referral Hospital. Findings of the study were submitted to Kibungo Hospital and the University of Rwanda, College of Medicine and Health Sciences, School of Public Health.
Results
Neonatal characteristics
A total of 422 neonates admitted to the neonatology department in 2017 were randomly selected, and their records reviewed. Among the 54 with neonatal sepsis 57% (31/54) were early onset and 43% (23/54) were late onset sepsis, and 38 (70%) recovered, while 16 (30%) died (Table 1).
Neonates’ mothers’ characteristics
Almost seven percent (7%) of the mothers experienced more than five pregnancies; most of them were employed or self-employed; most of the participants had health insurance (Table 2).
Neonatal sepsis characteristics, antibiotic susceptibility pattern and outcome
Fifty-four (12.8%) neonates were diagnosed with sepsis of whom 25 (46.3%) had blood cultures performed. Almost 84% (21/25) of the blood cultures were positive with Klebsiella pneumoniae predominance (62%), followed by coagulase-negative staphylococci (9.5%), Escherichia coli (9.5%), Streptococcus pneumoniae (9.5%), Acinetobacter baumanii (4.7%) and Staphylococcus aureus (4.7%). Bacteria sensitivity pattern revealed that 46.1% of the Klebsiella pneumoniae was resistant to ciprofloxacin but 100% were sensitive to meropenem and imipenem in carbapenems family of medications. Only 70.4% of neonates with sepsis survived (Table 1).
Environmental bacterial colonization monitoring
Environmental cultures reviewed were collected from surfaces of neonatology and maternity equipment such as incubators, lamps, nasal aspirator and oxygen concentrators, and showed the presence of various bacterial species in the neonatal and maternity wards: Enterobacter cloacae, Klebsiella pneumoniae, Serratia species, Providencia stuartii and Escherichia coli.
Bivariate analysis of neonatal characteristics
After bivariate analysis, neonates with a younger post-natal age group (p = 0.022) and younger gestational age (p = 0.031) were found to be significantly associated with neonatal sepsis (Table 3) and therefore, they were considered for multivariate logistic regression analysis. Association of Apgar score with neonatal sepsis was not statistically significant (p = 0.771).
Bivariate analysis of maternal characteristics
After the bivariate analysis of the maternal characteristics, it was seen that no maternal characteristic was statistically significant and eligible for the multivariable logistic regression (Table 4).
Multivariable analysis of characteristics associated with sepsis
Multivariable analysis was done only for the neonate characteristics that showed significant association with neonatal sepsis in bivariate analysis (neonate age and gestational weeks). Strong association with sepsis was found with neonatal age less or equal to three days (aOR: 2.769; 95% CI 1.312–5.843; p = 0.008), and gestational weeks less than 37 weeks (aOR: 4.149; CI 1.1878–9.167; p ≤ 0.001) (Table 3).
Discussion
The purpose of this study was to identify the risk factors associated with neonatal sepsis among neonates admitted in Kibungo Referral Hospital, Ngoma District, Rwanda during the calendar year of 2017. Neonatal sepsis prevalence was 12.8%, of whom 29.6% died. Decreasing deaths for newborns and mothers is a global priority to achieve Sustainable Development Goals, and to implement United Nations Global Strategy for Women, Children and Adolescent health5. Though Rwanda is among the few countries in Africa that achieved the fourth Millennium Development Goal to reduce child mortality, mortality rate among neonates is still of great concern. Neonatal sepsis is still a leading cause of neonatal morbidity and mortality in Rwanda, including in the study area47,48.
The 12.8% neonatal sepsis prevalence found in this study is almost similar to results reported in the Northwest Ethiopia (11.7%)49. But it is lower compared to reports from Ethiopia (33.8%), Tanzania (24%)50. The difference in neonatal sepsis prevalence may be due to the difference in the definitions of sepsis and the study settings in terms of infection prevention and control, staffing, funding, and policy.
In this study, early onset neonatal sepsis was slightly more common (57.4%) than late onset neonatal sepsis (42.6%). On the other hand, our study results contrasts with what was reported in a research conducted at Mansoura Hospital in Egypt, where early onset sepsis was lower at 44.2% compare to late onset sepsis at 55.8%51. This could be due to the differences in the characteristics of mothers and the setting where the study was conducted.
The sepsis fatality rate in this study was 29.6%, which is high and may reflect inadequate management of sepsis, perhaps linked to delays in diagnosis and treatment. This sepsis fatality rate is similar to the findings of a study from Tehran (27.4%)52. Blood cultures were not routinely performed in suspected cases, with only 25 of the 54 cases of suspected sepsis confirmed by culture. This could be due to the long interval between sending and receiving the culture results that might push physicians to treat suspected sepsis empirically. The predominance of Klebsiella pneumoniae was noted and the sensitivity pattern was similar to the findings from the research conducted in India where the isolated bacteria were sensitive to Meropenem and Imipenem with almost half of the isolated Klebsiella pneumonia bacteria species were resistant to Ciprofloxacin53. The findings of current study are different from a study done in Sudan that reported susceptibility of Klebsiella pneumoniae of 87% to Ciprofloxacin, and 81% to meropenem, which was caused by a variation of antimicrobial susceptibility patterns in bacteria54.
Multivariable analysis revealed that younger gestational age and postnatal age were both statistically significantly associated with neonatal sepsis. Neonates aged 3 days or less were more likely to develop sepsis which is comparable with the study done in Ethiopia neonates55,56. Premature rupture of membrane, place of delivery, intrapartum fever, Apgar Score < 7 at 10 min, low birth weight, meconium stained amniotic fluid, foul smelling amniotic fluid and assisted ventilation were not found to be associated factors, in contrast to the studies done in Mexico and Ethiopia which, of note, were conducted in urban settings19,57.
In this study, environmental cultures showed the presence of Enterobacter cloacae, Klebsiella pneumoniae, Serratia species, Providencia stuartii and Escherichia coli in the neonatal and maternity wards. The study done in Morocco, Brazil, Austria and India on neonatology environment reported the presence of different bacteria including Klebsiella pneumoniae, coagulase-negative staphylococci and other Enterobacteriaceae37,58,59,60. The presence of those bacteria isolates in the neonatal and maternity settings highlights the need to regularly monitor their environment and execute infection control by improving hygiene and sanitation.
Limitation of the study
One of the study limitation was the fact that data were collected in a single rural referral hospital in Rwanda. Therefore, the study results may not be directly applicable to other settings. Additionally, the use of secondary data may have limited the available data to assess for statistical association with neonatal sepsis in the study area.
Conclusion
The study highlighted that post-natal age ≤ 3 days, and gestation age < 37 weeks were significantly associated with neonatal sepsis. Improving the use of blood culture and consistent tailoring of antibiotics based on antibiotics susceptibility testing could enhance the management of neonatal sepsis.
Data availability
The datasets used and/or analyzed during the current study is available from the corresponding author on reasonable request.
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Acknowledgements
Our appreciation goes to Kibungo Referral Hospital and University of Rwanda-School of Public Health for their support during this study.
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J.C.N., J.N., J.O., and H.N. designed the study, collected, analyzed and interpreted the data, drafted and revised the manuscript. T.D., P.C.B., O.N., I.C. and H.F. participated in interpretation of data, drafted the manuscript and revised it critically. All authors approved the final version of the manuscript.
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Niyoyita, J.C., Ndayisenga, J., Omolo, J. et al. Factors associated with neonatal sepsis among neonates admitted in Kibungo Referral Hospital, Rwanda. Sci Rep 14, 15961 (2024). https://doi.org/10.1038/s41598-024-66818-z
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DOI: https://doi.org/10.1038/s41598-024-66818-z
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