Re: Institute for Disease Control weekly reports winter 2012-2013
Influenza Report, Week 2 (7/1 - 13/1), 2013
Report on the current flu situation
Editor: H?l?ne Englund
Contents
Influenza in Sweden
Influenza activity increased in the country, even during week 2 ( Figure 1 ). In total 304 cases of reported laboratory confirmed influenza, compared with 231 cases reported in week 1. Of these, 135 influenza A (H1N1) pdm09 ("swine flu"), 121 cases seasonal influenza A and 48 cases, influenza B ( Table 1 and Table 2 ), some A (H1N1) pdm09 cases have since been reported and diagnosed earlier in the season.
The increase in the number of laboratory-confirmed cases of seasonal influenza A seems to have stalled somewhat, while influenza B and A (H1N1) pdm09 continues to increase ( Figure 3 ). Development continues to resemble the 2010-2011 season, when we had a moderate and fairly early outbreak of A (H1N1) pdm09, but got a sharp peak of influenza B late in the season. Because all influenza seasons develop differently, it is difficult to predict what the near future will be developed, but it appears so far that the spread of A (H1N1) pdm09 has not accelerated as much in Sweden as it has previously done in Norway.
Influenza A (H1N1) pdm09 has primarily been demonstrated among children between 0 and 4 years of age and in adults between 15 and 30 years, while seasonal influenza A was most common in people over 65. Influenza B has so far affected all age groups fairly evenly. According to the clinical notifications for A (H1N1) pdm09 has all season 111 patients hospitalized, 12 of which have needed intensive care. The majority of intensive caring has been between 40 and 75 years. A man in late middle age with several underlying and serious risk factors for severe disease have died. His vaccination status is still unclear.
A (H1N1) pdm09 found throughout the country ( Table 3. Number of reported A (H1N1) pdm09 cases per county ). Incidence week 2 was still highest in V?rmland, but the outbreak appears to still be decaying there ( Figure 2 ). (After the reporting of influenza A (H1N1) pdm09 cases causing an apparently higher incidence of V?stra G?taland and S?dermanland for week 2 than would otherwise be the case.)
The sentinel reporting, we are above the baseline for the proportion of doctor visits for influenza-like illness (ILI) outpatient ( Figure 4 ). For week 2 reported 10.8 people per 100 000 inhabitants have sought medical advice because of ILS ( Table 4 ). within sentinel sampling, the number of submitted samples almost doubled from week 1, a total of 127 samples were received during the two weeks compared to 65 weeks samples first The percentage of positive samples for influenza have decreased from 40% to 23% ( Figure 5-6 , Table 5-6 ). This suggests that other than influenza viruses currently gives flu-like illness (see Other viral causes of respiratory infections in Sweden ) Web Searchlight graph of the number of people who searched for V?rdguiden.se for influenza-like illness plateaued at week 2 ( Web Search ). The number of people contacted in 1177 with questions about fever, cough and sore throat in adults and children fell for the second week in a row, but the number of searches is higher than normal for the season.
In summary, talking reports of care for increasing influenza activity, but the intensity is still normal for the season.
We would once again like to remind you that this year's seasonal vaccine contains three virus types circulating including A (H1N1) pdm09, and that there is the same vaccine that was given in the context of the pandemic. Seasonal vaccine has now been over three seasons to an estimated 1 billion people worldwide without any notable adverse reactions have been identified.
Information on seasonal vaccine and who belong to the risk group for severe disease and therefore recommended vaccinations available on the Board's website .
More detailed information on this year's vaccines are on SMI's website .
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Table 1 . Number of laboratory confirmed influenza cases, current week and cumulatively since week 40/2012, broken down by influenza A (H1N1) pdm09 and seasonal influenza A and B, and the number of samples analyzed and the percentage positive.
Influenza type / Current Week / Cumulatively
A (H1N1) pdm09 / 135 / 342
Seasonal Influenza A / 121 / 464
Seasonal influenza B / 48 / 159
Total cases / 304 / 965
Number of samples analyzed / 1209 / 7314
Percentage of positive samples / 25.1% / 13.2%
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Figure 1 . Number of cases of laboratorieverierad influenza (all subtypes) per week and season.
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