Enzyme-linked immunosorbent assays in seroprevalence studies of Q fever: the need for cut-off adaptation and the consequences for prevalence data.

Large outbreaks of Q fever have recently increased the awareness of this disease as a public health issue. Knowledge of the general impact of Q fever relies mainly on seroprevalence studies and it is fundamental that seroprevalence is assessed accurately. Therefore we evaluated the few enzyme-linked immunosorbent assays (ELISAs) commercially available for this purpose. An outbreak in 2005 in Jena, a city of 100,000 inhabitants, gave us the opportunity for the evaluation. However, we found disappointingly low sensitivities for two (42% and 51%) of three commercial ELISAs for detecting past infection. Nevertheless, all assays had good classification potential but cut-off adaptation is needed. Based on the unequal worldwide distribution of the differently performing tests in studies, Q fever seroprevalence is likely to be underestimated in studies from Europe whereas the data from North America and Australia are likely to be more reliable.

Effectiveness of a hospital-wide infection control programme on the incidence of healthcare-associated infections and associated severe sepsis and septic shock: a prospective interventional study.

OBJECTIVES: To evaluate whether a hospital-wide infection control programme (ICP) is effective at reducing the burden of healthcare-associated infections (HAIs) and associated severe sepsis/septic shock or death (severe HAIs). METHODS: Prospective, quasi-experimental study with two surveillance periods (September 2011 to August 2012; May 2013 to August 2014). Starting October 2012, the ICP included hand hygiene promotion and bundle implementation for common HAIs. We applied segmented mixed-effects Poisson regression and multi-state models. We reported adjusted incidence rate ratios (aIRR) and adjusted hazard ratios (aHR) with 95% confidence intervals (CI). RESULTS: Overall, 62 154 patients were under surveillance, with 1568 HAIs identified in 1170 patients (4.3 per 100 admissions) in the first and 2336 HAIs identified in 1711 patients (4.9 per 100 admissions) in the second surveillance period. No differences were found in the overall HAI incidence rates between the periods in the general wards (aIRR 1.29, 95% CI 0.78-2.15) and intensive care units (ICUs) (aIRR 0.59, 95% CI 0.27-1.31). However, the HAI incidence rate was declining in the ICUs after starting the ICP (aIRR 0.98, 95% CI 0.97-1.00 per 1-week increment), in contrast to general wards (aIRR 1.01, 95% CI 1.00-1.02). A reduction in severe HAIs (aIRR 0.13, 95% CI 0.05-0.32) and a lower probability of HAI-associated in-hospital deaths (aHR 0.56, 95% CI 0.31-0.99) were observed in the second period in the ICUs. CONCLUSIONS: There was no overall reduction in HAIs after implementation of the ICP. However, there was a significant reduction in severe HAIs in ICUs. Whether this difference was a consequence of the ICP or improvement in HAI case management is not clear.

[Peripheral venous catheter-related E. faecalis sepsis with fatal outcome]. / Fatale Sepsis nach Abszess bei peripherem Venenkatheter durch E. faecalis.

HISTORY AND ADMISSION FINDINGS: A 82 year-old man was admitted with a facial Herpes zoster reactivation and a zoster-related meningoencephalitis. He was treated with Aciclovir over a peripheral venous catheter that was placed in the right elbow pit. The meningoencephalitis subsided without neurological deficits, but the patient developed a catheter-associated phlebitis. An oral cephalosporin was prescribed and the patient discharged. After developing a fever and general discomfort he was readmitted to hospital three days later. INVESTIGATIONS: A 3 × 3 cm abscess in the elbow pit was incised and drained, but no swab or blood cultures were taken. When the patient's condition got worse an echocardiogram was ordered. It showed vegetations on the aortic and mitral valves as well as on the cardiac pacemaker wires. TREATMENT AND COURSE: Blood cultures were positive for Enterococcus faecalis. Although a therapy with vancomycin and ampicillin was started, the patient's condition impaired. Surgical valve replacement was initiated, but the patient expired 5 weeks later due to septic multi-organ failure. CONCLUSION: The danger of peripheral venous catheter infections is frequently underrated, early identification of the causing pathogen, sensitivity testing and proper antibiotic treatment are of tremendous importance. Clinical sings of sepsis must under no circumstances be overlooked.

[Effectiveness of a hospital-wide educational programme for infection control to reduce the rate of health-care associated infections and related sepsis (ALERTS)--methods and interim results]. / Nutzen eines krankenhausweiten Infektionspräventions-Programmes zur Reduktion nosokomialer Infektionen und assoziierter Sepsisfälle (ALERTS)--Methodik und Zwischenergebnisse.

BACKGROUND AND AIM: Health care associated infections (HAIs) are one of the most frequent complications of hospital care, associated with increased morbidity, mortality and considerable extra costs for the health care system. The overarching objective of the ALERTS study is to demonstrate the feasibility of a hospitalwide programme to reduce the burden of HAIs and related sepsis of at least 20 %. METHODS: Prospective, quasi-experimental study covering all acute care units (27 general wards, 4 ICUs, overall 809 beds) at Jena University Hospital. Surveillance for HAIs is performed by computerized antibiotic monitoring in patients with risk factors for HAIs (i. e. intravenous and urinary catheters, surgery) on a daily basis. Following the first surveillance period a multifaceted, pragmatic infection control programme, aimed at proper hand hygiene and bundles for the prevention of the four most common HAIs will be implemented. Subsequently, a second surveillance period lasting 18 months will be conducted to measure the effect of the infection control programme, starting in May 2013. RESULTS: Interim results for the first surveillance period (09/2011 to 08/2012) are presented. During this period, 30,631 patients were admitted to the participating departments. According to CDC definitions we identified 1,637 HAIs, resulting in an overall incidence of 5.3 %. Based on clinical evaluation only, irrespective of the CDC definitions, an additional 944 HAIs were detected (overall HAI rate, 8.4 % [n =2581]). A substantial proportion of patients had HAI associated severe sepsis or septic shock (lower respiratory tract infection, n = 279 [37 %]; surgical site infection, n = 114 [25 %]; primary sepsis, n = 110 [32 %]; urinary tract infection, n = 46 [8 %]; other, n = 87 [22 %]). CONCLUSION: Our numbers reveal that a high number of HAIs are missed using CDC-definitions and therefore the magnitude of the problem might be underestimated. Furthermore, a high percentage of HAIs progress from localized infection to severe sepsis or septic shock, requiring ICU treatment.