CRP under 130 mg/L rules out the diagnosis of Legionella pneumophila serogroup 1 (URINELLA Study).

INTRODUCTION: In case of pneumonia, some biological findings are suggestive for Legionnaire's disease (LD) including C-reactive protein (CRP). A low level of CRP is predictive for negative Legionella Urinary-Antigen-Test (L-UAT). METHOD: Observational retrospective study in Nord-Franche-Comté Hospital with external validation in Besançon University Hospital, France which included all adults with L-UAT performed during January 2018 to December 2022. The objective was to determine CRP optimal threshold to predict a L-UAT negative result. RESULTS: URINELLA included 5051 patients (83 with positive L-UAT). CRP optimal threshold was 131.9 mg/L, with a negative predictive value (NPV) at 100%, sensitivity at 100% and specificity at 58.0%. The AUC of the ROC-Curve was at 88.7% (95% CI, 86.3-91.1). External validation in Besançon Hospital patients showed an AUC at 89.8% (95% CI, 85.5-94.1) and NPV, sensitivity and specificity was respectively 99.9%, 97.6% and 59.1% for a CRP threshold at 131.9 mg/L; after exclusion of immunosuppressed patients, index sensitivity and NPV reached also 100%. CONCLUSION: In case of pneumonia suspicion with a CRP level under 130 mg/L (independently of the severity) L-UAT is useless in immunocompetent patients with a NPV at 100%. We must remain cautious in patients with symptoms onset less than 48 h before CRP dosage.

Disseminated Yersinia enterocolitica infection associated to Sweet's syndrome.

We report the case of a young woman sough care for disseminated form of Yersinia enterocolitica infection (pseudoappendicitis with mesenteric lymph node, arthralgia, glomerulonephritis and hepatitis) diagnosed on Western Blot method for the detection of Yersinia antibodies. The patient also presented a rare concomitant cutaneous manifestation, as Sweet's syndrome, confirmed histologically. Neutrophilic dermatosis is an exceptional skin features among post-infectious autoimmune disorders when encountering Yersinia enterocolitica infection in clinical practice.

Outbreak of Mycoplasma pneumoniae pneumonia in hospitalized patients: Who is concerned? Nord Franche-Comté Hospital, France, 2023-2024.

We report an outbreak of confirmed Mycoplasma pneumoniae community-acquired pneumonia (CAP) in Nord Franche-Comté Hospital, France, from 14 November 2023 to 31 January 2024. All 13 inpatients (11 adults with a mean age of 45.5 years and 2 children) were diagnosed with positive serology and/or positive reverse transcription polymerase chain reaction (RT-PCR) on respiratory specimens. All patients were immunocompetent and required oxygen support with a mean duration of oxygen support of 6.2 days. Two patients were transferred to the intensive care unit (ICU) but were not mechanically ventilated. Patients were treated with macrolides (n = 12, 92.3%) with recovery in all cases. No significant epidemiological link was reported in these patients.

Early neurosyphilis with serofast state.

We report a rare case of confirmed early neurosyphilis with serofast state in HIV-negative patient, with uncontrolled type 2 diabetes mellitus. Syphilitic meningitis was diagnosed initially on serology and cerebrospinal fluid (CSF) analysis. The patient had persistently raised non-treponemal titres on serum with negative CSF venereal disease research laboratory result, following treatment during 3 years of follow-up.

Posterior reversible encephalopathy syndrome in early lyme neuroborreliosis.

We report a case of posterior reversible encephalopathy syndrome in an adult patient fulfilling criteria for proven early Lyme neuroborreliosis.

Acute Cerebellitis Following COVID-19: Alarming Clinical Presentation Challenged by Normal Paraclinical Findings.

We report the case of an acute cerebellitis following COVID-19 in 32-year-old man who presented with a life-threatening critical cerebellar syndrome contrasting with normal paraclinical findings. Despite this fulminant critical presentation, the patient fully recovered in 37 days after early treatment with high-dose steroids and intravenous immunoglobulins. This case highlights the need for clinicians to be aware of acute cerebellitis following COVID-19, despite normal laboratory, imaging and electroencephalography findings and the importance to start appropriate treatment as soon as possible.