Factors linked to Kawasaki disease and MIS-C in children with prolonged fever: A retrospective cohort study

Prolonged fever in children


  • Özlem Erdede Department of Pediatrics, Zeynep Kamil Maternity and Children’s Disease Training and Research Hospital, University of Health Sciences, Istanbul, Turkey ORCID https://orcid.org/0000-0002-5490-5361
  • Kübra Alkan Department of Pediatrics, Zeynep Kamil Maternity and Children’s Disease Training and Research Hospital, University of Health Sciences, Istanbul, Turkey ORCID https://orcid.org/0000-0002-0150-023X
  • Erdal Sarı Department of Pediatrics, Zeynep Kamil Maternity and Children’s Disease Training and Research Hospital, University of Health Sciences, Istanbul, Turkey ORCID https://orcid.org/0000-0002-9967-1669
  • Serpil Değrmenci Department of Pediatrics, Zeynep Kamil Maternity and Children’s Disease Training and Research Hospital, University of Health Sciences, Istanbul, Turkey ORCID https://orcid.org/0009-0005-9937-871X
  • Rabia Gönül Sezer Yamanel Department of Pediatrics, Zeynep Kamil Maternity and Children’s Disease Training and Research Hospital, University of Health Sciences, Istanbul, Turkey ORCID https://orcid.org/0000-0002-9447-3583


prologed fever, Kawasaki Disease, child, multisystem inflammatory syndrome in children


Background/Aim: Prolonged fever in children presents a diagnostic challenge due to its diverse underlying causes. While infectious diseases historically played a primary role, recent shifts in disease patterns and the emergence of conditions such as multisystem inflammatory syndrome in children (MIS-C) have added complexity. Understanding factors contributing to prolonged fever, particularly the rise in MIS-C and Kawasaki Disease (KD), is vital for accurate diagnosis and timely intervention. This study aimed to identify the etiologies causing prolonged fever in children with temperatures exceeding 38°C for a minimum of 5 days and to examine its relationship with conditions like MIS-C and KD following the coronavirus disease 2019 (COVID-19) pandemic.

Methods: We conducted a retrospective cohort study at a pediatric hospital in Istanbul, Turkey, involving 243 children aged 3 months to 17 years with prolonged fever (>38°C for ≥5 days) between April 2020 and October 2022. We collected data on patient demographics, clinical characteristics, laboratory results, and final diagnoses. The study categorized patients into Group 1 (KD and MIS-C) and Group 2 (other causes). We performed logistic regression analysis to identify factors associated with KD and MIS-C, using hospitalization days and levels of C-reactive protein (CRP), ferritin, and D-dimer. We calculated sensitivity, specificity, and likelihood ratio values and generated ROC (Receiver operating characteristic) curves. The threshold for statistical significance was set at P<0.05.

Results: This study encompassed 243 patients with prolonged fever. The primary causes of admission included infection-related illnesses (60.91%, n=148), MIS-C (18.52%, n=45), and KD (10.70%, n=26). Significant differences were observed in lymphocyte count (P<0.001), CRP level (P<0.001), ferritin level (P<0.001), D-dimer level (P<0.001), hospitalization days (P<0.001), and echocardiographic findings (P<0.001) between the groups. Logistic regression analysis revealed noteworthy associations between the presence of KD and MIS-C and hospitalization days (P=0.001), elevated CRP levels (P=0.018), elevated ferritin levels (P=0.009), and elevated D-dimer levels (P=0.001). Ferritin exhibited an AUC (Area under curve) of 0.737 (P<0.001), and D-dimer demonstrated an AUC of 0.782 (P<0.001) in differentiating between the presence of KD and MIS-C.

Conclusion: The prevalence of infectious and inflammatory conditions remains high in cases of prolonged fever, with a noticeable increase in the occurrence of KD and MIS-C since the onset of the COVID-19 pandemic. Notably, ferritin, CRP, and D-dimer levels are valuable indicators for identifying children at elevated risk of developing KD and MIS-C. While data were collected during the epidemic, additional data collection beyond this period would be necessary.


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Research Article

How to Cite

Erdede Özlem, Alkan K, Sarı E, Değrmenci S, Sezer Yamanel RG. Factors linked to Kawasaki disease and MIS-C in children with prolonged fever: A retrospective cohort study: Prolonged fever in children. J Surg Med [Internet]. 2023 Sep. 5 [cited 2023 Nov. 29];7(9):536-41. Available from: https://jsurgmed.com/article/view/7928