Lyme disease is very common in southern Sweden, with a relatively high frequency of neurologic complications and arthritis. With the exception of the low incidence of carditis, the pattern of disease we found in Sweden was similar to that reported in the United States.

Phase variation of lipopolysaccharide epitope' of an Haemophilus influenzae serotype b strain (strain RM.7004) occurs through,-a mechanism which depends on multiple tandem repeats of the DNA sequence 5'-CAAT-3' situated within the chromosomal locus-licl. We report here that the same tetranucleotide repeats are also found in two other genomic loci (lic2 and iic3) of RM. ') from the repeats of CAAT in lic2 abolished phase variation and identified DNA sequences required for the expression of additional oligosaccharide epitopes. When we used an oligonucleotide comprising five repeats of CAAT or DNA sequences specific for licl, lc2, and lic3 as probes, a survey of other encapsulated H. influenzae strains (serotypes a through f) and nontypable H. ii*fluenzae strains (including biotype aegyphus) showed that the chromosome ofH. influenzae can have from two to five regions which contain multiple tandem repeats of CAAT in addition to other sequences which hybridize to licl and lic2. Haemophilus influenzae lipopolysaccharide (LPS) is char-acterized by both inter-and intrastrain heterogeneity of the surface-exposed, neutral sugars of its core oligosaccharides (9, 12, 28). The intrastrain variation is due, at least in part, to a pattern of antigen switching (12) referred to as phase variation. Strains of H. influenzae undergo spontaneous, high-frequency gain and loss of reactivity with monoclonal antibodies (MAbs) which define epitopes of the core oligosaccharides of the LPS. Through phase variation of multiple epitopes the bacterium can express a diverse, but limited, number of different surface structures (28). Phase variants which express specific epitopes have enhanced virulence in an animal model (12) and are selected for or induced in the course of systemic infections of humans (29). The structure of one of these epitopes has been identified as

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Background.Although sepsis is a major health problem, data on sepsis epidemiology are scarce. The aim of this study was to assess the incidence of sepsis, based on clinical findings in all adult patients treated with intravenous antibiotic in all parts of all hospitals in an entire population.Methods.This is a retrospective chart review of patients ≥18 years, living in 2 regions in Sweden, who were started on an intravenous antibiotic therapy on 4 dates, evenly distributed over the year of 2015. The main outcome was the incidence of sepsis with organ dysfunction. The mean population ≥18 years at 2015 in the regions was 1275753. Five hundred sixty-three patients living in the regions were started on intravenous antibiotic treatment on the dates of the survey. Patients who had ongoing intravenous antibiotic therapy preceding the inclusion dates were excluded, if sepsis was already present.Results.Four hundred eighty-two patients were included in the study; 339 had a diagnosed infection, of those, 96 had severe sepsis according to the 1991/2001 sepsis definitions, and 109 had sepsis according to the sepsis-3. This is equivalent to an annual incidence of traditional severe sepsis of 687/100000 persons (95% confidence interval [CI], 549–824) or according to the sepsis-3 definition of 780/100000 persons (95% CI, 633–926). Seventy-four patients had sepsis according to both definitions.Conclusions.The incidence of sepsis with organ dysfunction is higher than most previous estimates independent of definition. The inclusion of all inpatients started on intravenous antibiotic treatment of sepsis in a population makes an accurate assessment of sepsis incidence possible.