Risk factors for COVID-19-related death, hospitalization and intensive care: a population-wide study of all inhabitants in Stockholm.

Since the beginning of the Covid-19 pandemic, the scientific community has explored determinants of Covid 19 disease severity. However, the majority of studies are based on in-hospital patients with high risk of collider- or selection bias. The present investigation details risk factors associated with overall mortality, hospitalization and intensive care unit (ICU) admission in Covid-19 infections, with complete population coverage and high-resolution data on patient characteristics and comorbid conditions This population-based observational study comprises all residents 18 years and older in Stockholm Region-1.8 million inhabitants-using the real-time Covid-19 monitoring framework. The observation period lasted between March 1 to December 31, 2020. Hazard ratios (HR) for risk factors of Covid-19 disease severity were assessed using Cox proportional hazard models. In total, 3322 deaths, 11,508 hospitalizations and 1423 ICU-admissions related to Covid-19 occurred during the study period. Kidney failure, diabetes and obesity increased risk of mortality and so did heart failure and ischemic heart disease. However, atrial fibrillation and hypertension did not. Risk of hospitalization follow a similar pattern, whereas admission to intensive care differs; triage processes where clearly present as certain co-morbid conditions were associated with lower ICU admission. Observed differences in risk of mortality and hospitalization among patients with Covid 19 raise important questions about potentially protective comedication which will be further addressed using the real-time Covid-19 monitoring framework.

Influenza epidemiology among hospitalized children in Stockholm, Sweden 1998-2014.

BACKGROUND: Influenza remains a common reason for the hospitalization of children. There is a need for long term studies that are also population based. We describe the epidemiology of severe influenza in a defined population 1998-2014. METHOD: Retrospective study of annually collected data of virologically confirmed influenza in hospitalized children 0-17 years living in the catchment area (230,000 children). We gathered information about comorbidity and complications from case records, and compared Influenza A, B and A(H1N1)pdm09 with respect to these factors. RESULTS: A total of 922 children with influenza were hospitalized. The mean rate remained unchanged at 22.5-24.2 per 100,000 children per year. There were two major outbreaks: influenza A(H3N2) in 2003-2004 and the A(H1N1) pandemic in 2009-2010. The proportion of children with influenza B increased from 8% during the first half of the study period to 28% during the second half. The highest admission rate was found in children <3 months of age, 169 per 100,000. Children with influenza B were older than those with influenza A. Comorbidity was found in 34%, complications in 41%, and 11% needed intensive care management. The mortality rate was 0.17/100,000 children. CONCLUSION: Influenza remains an important reason for the hospitalization of children, especially during the first years of life. The increasing proportion of influenza B may have to be considered when recommending influenza vaccines.

Performance of the Simplexa™ Flu A/B & RSV Direct Kit on respiratory samples collected in saline solution.

BACKGROUND: Molecular assays for diagnosis of influenza A, influenza B, and respiratory syncytial virus (RSV) with short turnaround time are of considerable clinical importance. We have evaluated the diagnostic performance of the Simplexa(™) Flu A/B & RSV Direct Kit, which has a run time of 60 min, using different types of respiratory samples collected from patients with a suspected respiratory tract infection, including materials not previously evaluated on this kit. METHODS: In total, 210 clinical respiratory samples were analyzed using both the Simplexa direct assay and a laboratory-developed assay (LDA). The 210 clinical samples included 99 nasopharyngeal aspirates collected in 0.9% saline, 91 nasopharyngeal swabs in Σ-Virocult transport medium, 9 tracheal secretions, 8 bronchoalveolar lavages (BAL), and 3 other respiratory sample materials. RESULTS: The specificity of the Simplexa assay, using the LDA as gold standard and excluding secondary viral findings, was 100% for all three viruses, whereas the sensitivity was 94.0% for influenza A (47/50), 90.7% for influenza B (49/54), and 90.1% for RSV (46/51), respectively. Discordant results were only observed for samples with cycle threshold values (Ct) > 31 in the LDA. The Simplexa assay generated higher Ct values than the LDA for all three viruses and performed equally well on nasopharyngeal swabs and aspirates. CONCLUSIONS: The short run time of the Simplexa direct assay, in combination with high specificity and good sensitivity regarding the sample materials used in this study, make it an interesting option for rapid detection of these three important viral respiratory pathogens in a variety of clinical sample materials.

Molecular epidemiology and genetic variability of respiratory syncytial virus (RSV) in Stockholm, 2002-2003.

The epidemiology and genetic variability of circulating respiratory syncytial virus (RSV) strains in Stockholm during the season 2002-2003 were studied in consecutive RSV isolates derived from respiratory samples and diagnosed in the laboratory. Two hundred thirty-four viruses were sequenced. The samples were mainly from children under 1 year old (79%). The phylogeny of the N-terminal part of the G gene was studied after amplification and sequencing. One hundred fifty-two viruses belonged to subgroup B and 82 to subgroup A. The subgroup A viruses could be further divided into genotypes GA2 (25) and GA5 (57) and the subgroup B viruses into GB3 (137) and SAB1 (15) strains. These strains clustered with subgroup A and subgroup B strains from Kenya from the same period, as well as with strains from Great Britain from 1995 to 1998. The dominance of subgroup B strains in Stockholm during 2002-2003 is in agreement with findings from other parts of the world during the same years. Only two genotypes of subgroup A, GA2 and GA5, were circulating during this time, and GA2 has been circulating in Sweden for more than 20 years. Consecutive strains from the same individual displayed no variability in the sequenced region, which was also true of strains that had been passaged in cell cultures.

Respiratory virus infections in Stockholm during seven seasons: a retrospective study of laboratory diagnosis.

A retrospective analysis of the virological findings in all respiratory samples (7303) analysed at the laboratory of Karolinska Hospital between 1993 and 2000 was performed. The findings were studied according to age and seasonal variation, and the methods were evaluated. Most samples were from children. RSV was the dominant agent, found in 34% of all samples from children 0-1 y of age. Influenza A was found in 13% of samples from the age group 2-5 y. Influenza A dominated among adults and the elderly. RSV was found only in 2% of samples from patients 81 y or older. Adenovirus was found among children and adults, but not at all among the elderly. Both antigen detection and virus isolation were performed on 79% (5776) of the samples. For diagnosis of influenza A, virus isolation was more sensitive than immunofluorescence, but for diagnosis of RSV immunofluorescence was more sensitive than virus isolation. Thus, the analysis verified that influenza A is common not only among adults and the elderly, but also among small children. RSV was an uncommon finding among the elderly. Immunofluorescence is sensitive and rapid for the diagnosis of particularly RSV among small children and influenza in all age groups.

Japanese encephalitis in a swedish tourist after travelling to Java and Bali.

Japanese encephalitis (JE) is a rare diagnosis outside endemic areas. A case report of the disease in an 80-y-old man after a short time visit to Java and Bali is presented.

The occurrence of antibodies against Chlamydia species in patients with monoarthritis and chronic closed lock of the temporomandibular joint.

PURPOSE: The study goal was to investigate the occurrence of serum antibodies to Chlamydia trachomatis, Chlamydia pneumoniae, and Chlamydia psittaci in patients with temporomandibular joint (TMJ) monoarthritis or chronic closed lock and in control subjects. PATIENTS AND METHODS: An indirect microimmunofluorescence test for detecting antibodies against C trachomatis was used. Twenty-three patients (12 with monoarthritis and 11 with chronic closed lock) and 42 control subjects were evaluated. RESULTS: Six patients with monoarthritis, 5 patients with chronic closed lock of the TMJ, and 6 control individuals were considered to have had a past C trachomatis infection based on their immunoglobulin G titers. Corresponding groups for C pneumoniae investigation included 3 patients with monoarthritis, 4 patients with chronic closed lock, and 17 control subjects, and for C psittaci, 1 patient with monoarthritis, 2 patients with chronic closed lock, and 1 control subject. Statistically significant differences between patients and control subjects were found for C trachomatis only; monoarthritis versus control (P =.016), chronic closed lock versus control (P =.038), and all patients versus control (P =.007). Patients with monoarthritis did not differ from patients with chronic closed lock with regard to antibodies against C trachomatis. CONCLUSION: The occurrence of serum antibodies to C trachomatis was significantly higher in patients than in control subjects, but this occurrence did not correlate with severity of observed tissue changes. Nevertheless, an association may exist between the presence of C trachomatis and TMJ disease.