[Invasive meningococcal disease in children and adults in a tertiary level hospital. Recent epidemiology and prognostic factors].

INTRODUCTION

Invasive meningococcal disease (IMD) has a high morbidity and mortality in children and adults. The aim of this study was to describe the clinical and epidemiological characteristics of patients with IMD, to compare them among children and adults, and to determine prognostic factors and changes in epidemiology during a 14-year period.

METHODS

A retrospective study was conducted on patients admitted to a third level hospital with IMD between 2004 and 2017. An analysis was made of the clinical, epidemiological and microbiological data.

RESULTS

A total of 84 patients were diagnosed with IMD, of which 50 (59.5%) were children. Median age was 2 years (IQR 0.7-7.5) for children and 41.2 years (IQR 26.4-69.3) for adults. Diagnosis was bacteraemia in 47 patients (56%), meningitis in 24 (28.6%), and both in 13 (15.5%). Serogroup B (MenB) was the most common cause of IMD (40.5%), followed by serogroup C (MenC) in 15.5%, which was more common among adults (26.5% vs 8%, P=.022). Incidence rate decreased between 2004-2010 and 2011-2017, from 3.14 to 1.33 cases/100.000 emergencies attended in the study hospital (P<.001). Eighty-four percent of children had received≥1 dose of vaccine against MenC, with none against MenB. Children had higher proportion of ICU admissions (78% vs 44.1%, P=.001). Mortality was slightly higher in adults (11.8% vs 2.0%, P=.153). Adverse outcomes (sequelae or mortality) were independently associated with intubation and thrombocytopenia, while disease severity with leukopenia and purpuric rash.

CONCLUSIONS

IMD incidence has decreased in our setting, with MenB being the most common serogroup. The higher prevalence of MenC in adults was probably related to lower vaccination coverage. According to this study, thrombocytopenia, leukopenia, and purpuric rash were parameters associated with worse outcome.