• Jennifer L St Sauver, Robert M Jacobson, Susan A Weston, Chun Fan, Roderick A McPhee, Philip O Buck, and Susan A Hall.
• Division of Epidemiology, Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA.
• Curr Med Res Opin. 2024 Nov 1; 40 (11): 188518911885-1891.

ObjectiveInfectious mononucleosis (IM) or mono is typically caused by primary infection with Epstein-Barr virus (EBV) and may have a months-long, complicated course. We utilized population-based data to add to the limited literature on health care utilization following EBV infection.MethodsThe Rochester Epidemiology Project includes medical records for ∼60% of residents living in 27 counties of Minnesota (MN) and Wisconsin (WI). Persons meeting a case definition of recent EBV infection from 1 January 1998 to 31 December 2021 were compared to three persons not meeting the definition, matched on case's sex, age, and index date. Emergency department (ED) visits and hospitalizations in the two groups were compared during 5-years' follow-up divided into three periods (short-term ≤3 months, mid-term >3 months-1 year, long-term >1-5 years). Adjusted hazard ratios (AHR) were estimated to account for the potential influence of confounding variables.ResultsIn total, 6,423 persons had a recent EBV infection and were matched to 19,269 comparators. The risk of an ED visit was significantly higher among cases in the short-term period (24.3% vs referents: 7.6%, p <.001; AHR = 3.71, 95% CI = 3.41-4.03). Cases also had an increased risk of hospitalization in the short-term (5.2% vs 1.6%: referents, p <.001; AHR = 3.53, 95% CI = 2.94-4.24). For ED visits but not hospitalization, the excess risk persisted into the mid-term follow-up period. Persons without a concurrent clinical diagnosis of IM continued to have an increased risk of hospitalizations up to 1 year after index date (AHR = 1.45, 95% CI = 1.09-1.91) and an increased risk of ED visits up to 5 years after the index date (AHR = 1.29, 95% CI = 1.14-1.46).ConclusionThere is a substantial short- and mid-term increased risk of serious health care encounters associated with recent EBV infection. Mid- and long-term risks are increased in patients who do not have a concomitant diagnosis of IM.

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