To assess genetic variability of A H1N1 pan influenza virus (IV) in the course of the epidemic and to detect a set of human nucleotide polymorphisms responsible for a severe course of the disease.
Extraction and purification of viral genomic RNA from the nasopharyngeal smears and genomic human DNA from the leukocytic fraction of venous blood was made in 230 patients from Moscow. Moscow and Sverdlovsk Regions with severe acute respirator, virus infection (ARVI). A flu virus type was established in amplification reaction with on-line detection of the products with application of primers recommended by WHO. Genetic polymorphisms of A H1N1 pan IV and human genes were determined with minisequencing reaction followed by detection of the products of MALDI-time-of-flight mass-spectrometry. Nucleotide sequences of the complete genome were revealed for 15 isolates of A H1N1 pan IV.
A H1N1 IV was identified in 77 cases (46 were pandemic, 31 seasonal). Mutations causing genetically determined resistance to adamants (amantadin, rimantadin) were detected in all 46 samples of genomic RNA of A H1N1 pan IV. Mutation leading to oseltamivir (tamiflu) resistance was found in one sample. It is shown that a severe course of A H1N1 pan IV infection is associated with genotypes predisposing to development of thromboses, bronchopulmonary diseases and hypertention. Genetic tests for prognosis of a complicated course of the flu are proposed. The revealed full-genome sequences of the segments of genomic RNA of 15 A H1N1 pan influenza viruses are deposited in GenBank.
We are the first in Russia to detect a mutant variant of A H1N1 pan IV resistant to oseltamivir We describe a set of nucleotide polymorphisms which determine a complicated course of the flu in patients with identified A H1N1 pan IV.
An Israeli researcher working in Finland with Bank Voles, contracted an infectious viral disease and died. This was a rare event, but it is important to learn about this class of viruses and to be aware of the hazards while working in the field in close contact with wild animals. The virus termed Puumala belongs to the genus Hanta from the Bunyaviridae family. The natural reservoir is rodents, mice, rats and Bank Votes for the Puuamala strain. The disease is termed HFRS (hemorrhagic fever with renal syndrome), is prevalent in Asia and Europe, affecting 200,000 people a year, with 5-15% percent mortality (although in Finland mortality rate is 0.1%). The New World strains cause HPS (hemorrhagic pulmonary syndrome) affecting 200 people a year with 40% mortality. Virus is present in all rodents excretions, and route of infection is by aerosols, hand to mucus membranes contamination, by rodents bites and by contaminated food or water. More than 226 work related infections were documented. Treatment with Ribavirin helps in HFRS but not in HPS. The virus is stable in the environment for long periods, and research must be carried out at biosafety level 3. Working outdoors in rodent infested area, should be carried out using protective clothing, gloves, googles and face mask whenever aerosol producing tasks are performed. Both indoor and outdoor, it is important to adhere to self-hygienic procedures, especially hand washing.
Alpha interferon therapy in Danish haemophiliac patients with chronic hepatitis C: results of a randomized controlled open label study comparing two different maintenance regimens following standard interferon-alpha-2b treatment.
Following a survey among all Danish haemophiliac patients 49 HIV-negative patients with chronic hepatitis C were offered enrollment in a randomized controlled open label study comparing two different maintenance regimens following standard interferon-alpha-2b treatment. Dose modifications and treatment discontinuation were based upon changes in transaminase levels. Forty-seven patients enrolled received 3 MU of alpha interferon thrice weekly (TIW) for 3 months. Twenty-six nonresponders had their dose increased to 6 MU TIW for an additional 3 months, while 21 responding patients continued on 3 MU TIW. At 6 months, 25 patients with a complete or a partial biochemical response were randomly allocated to either a fixed dose regimen (13 patients) (3 or 6 MU thrice weekly) or an individualized dose regimen (12 patients) tapering interferon dose from 3 or 6 MU by one-third every 2 months if transaminases were persistently normal. The remaining 22 biochemical nonresponders were followed for an additional 6 months without further treatment. After 12 months of treatment, 18 patients (38%) had a virological response, irrespective of regimen, and seven patients (16%) had a sustained virological and biochemical response after 6 months of follow up. Overall, the individualized treatment regimen did not seem to offer any advantage over the fixed dose regimen. The response to alpha interferon treatment in Danish haemophiliac patients with chronic hepatitis C immediately after treatment is comparable to that obtained in previous studies among nonhaemophiliacs. However, a sustained virological and biochemical response was seen in only 16% of treatment patients.
The National Advisory Committee on Immunization (NACI) provides Health Canada with ongoing and timely medical, scientific, and public-health advice relating to immunization. Health Canada acknowledges that the advice and recommendations set out in this statement are based upon the best current available scientific knowledge, and is disseminating this document for information purposes. Persons administering or using the vaccine should also be aware of the contents of the relevant product monograph(s). Recommendations for use and other information set out herein may differ from that set out in the monograph(s) of the Canadian licensed manufacturer(s) of the vaccine(s). Manufacturer(s) have only sought approval of the vaccine(s) and provided evidence as to its safety and efficacy when used in accordance with the product monographs.
Erratum In: Can Commun Dis Rep 1998 Jul 15;24(14):120
Erratum In: Can Commun Dis Rep 1998 Oct 15;24(20):168
We examined correlates of antinuclear antibody (ANA) positivity (ANA+) in individuals with chronic hepatitis C virus (HCV) infection and the effect of positivity on clinical outcome of HCV. Pretreatment sera from 645 patients from three centres in Sweden (n = 225), the UK (n = 207) and Italy (n = 213) were evaluated by indirect immunofluorescence on Hep-2 cells for ANA pattern and titre by a single laboratory. Liver biopsies were all scored by one pathologist. A total of 258 patients were subsequently treated with interferon monotherapy. There was a significant difference in the prevalence of ANA (1:40) by geographic location: Lund 4.4%, London 8.7%, Padova 10.3% [odds ratio (OR) = 0.66; 95% CI: 0.46-0.94; P = 0.023]. Duration of HCV infection, age at infection, current age, route of infection, viral genotype, alcohol consumption, fibrosis stage and inflammatory score were not correlated with ANA+ or ANA pattern. Female gender was correlated with ANA+ and this association persisted in multivariable analyses (OR = 3.0; P = 0.002). Increased plasma cells were observed in the liver biopsies of ANA-positive individuals compared with ANA-negative individuals, while a trend towards decreased lymphoid aggregates was observed [hazard ratio (HR) = 9.0, P = 0.037; HR = 0.291, P = 0.118, respectively]. No correlations were observed between ANA positivity and nonresponse to therapy (OR = 1.4; P = 0.513), although ANA+ was correlated with faster rates of liver fibrosis, this was not statistically significant (OR = 1.8; P = 0.1452). Low titre ANA+ should not be a contraindication for interferon treatment. Our observation of increased plasma cells in ANA+ biopsies might suggest B-cell polyclonal activity with a secondary clinical manifestation of increased serum immunoglobulins.
To model the potential impact of HIV infection rates and the use of antiretroviral medication on life expectancy and mortality in the Downtown Eastside of Vancouver, British Columbia, Canada, from 1999 to 2006.
Population projections were made to estimate the population of the Downtown Eastside in the year 2006.
Two scenarios were modelled to predict the impact of HIV infection and antiretroviral use on mortality and life expectancy. The use of antiretroviral therapy was estimated to be 80% in the first scenario and 20% in the second. The prevalence of HIV by age and sex, and by year infected was estimated using data from the Vancouver Injection Drug User Study.
If the level of antiretroviral therapy use among HIV-positive individuals was 80% at baseline, then we estimate that the life expectancy at birth in the year 2006 will be 60.8 years for men and 72.8 years for women, and 172 AIDS deaths will occur between 1999 and 2006. In contrast, if the present level of antiretroviral medication use persists, the life expectancy at birth in the year 2006 will be 56.9 years for men and 68.6 years for women, and 503 AIDS deaths will occur between 1999 and 2006.
Our analysis suggests that if the low levels of antiretroviral therapy use persist, life expectancy in Vancouver's Downtown Eastside will soon be on a par with many of the world's least developed countries. Our findings highlight the large health status decline that can be expected in many inner city neighbourhoods if low levels of antiretroviral use persist. Although reasonable coverage targets for injection drug users (IDU) have not been established, the expanded use of antiretroviral medication is urgently needed to avert a drastic decline in health status.
We conducted a prospective cohort study to assess the impact of antiviral therapy on outcomes of patients hospitalized with influenza in southern Ontario, Canada.
Patients admitted to Toronto Invasive Bacterial Diseases Network hospitals with laboratory-confirmed influenza from 1 January 2005 through 31 May 2006 were enrolled in the study. Demographic and medical data were collected by patient and physician interview and chart review. The main outcome evaluated was death within 15 days after symptom onset.
Data were available for 512 of 541 eligible patients. There were 185 children (
Exactly 30 years ago, hepatitis C virus was identified. Over the years, tremendous success has been achieved in the treatment of hepatitis C, which is currently considered to be an almost completely curable disease. The review presents the main stages in the development of hepatitis C antiviral therapy, the efficacy of various treatment regimens. The greatest progress in treatment was noted over the past 5 years when drugs with direct antiviral action appeared and began to be widely used, including in Russia, which ensure the elimination of the virus in 90-95% of cases.