Winter health watch summary: 30 March 2017
Published 30 March 2017
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This publication is available at https://www.gov.uk/government/publications/winter-health-watch-summary-30-march-2017/winter-health-watch-summary-30-march-2017
1. Summary
1.1 Cold Weather Alert
All regions are at level 1 (winter preparedness and alert). Please note that the Cold Weather Alerts are due to end on the 31 March 2017, as per the Cold Weather Plan for England.
Prior cold weather alerts have been in place this season from:
- 8 to 9 November
- 18 to 21 November
- 24 to 26 November
- 28 November to 6 December
- 27 December to 31 January
- 5 to 13 February
- 23 February to 25 February
- 27 February to 4 March
1.2 Flu
During week 12 (ending 26 March 2017), influenza activity continues to decrease across all indicators. The Department of Health has issued an alert on the prescription of antiviral medicines by GPs.
1.3 Syndromic Surveillance
Respiratory infections remained within seasonally expected limits during week 12.
1.4 Norovirus
Reports of suspected and confirmed outbreaks of norovirus in hospitals continue to be reported at lower levels than in previous years.
The number of laboratory reports of norovirus in this season* (since week 27 2016) is 4643. This is 10% lower than the average number for the same period in the 5 seasons from season 2011 to 2012 to season 2015 to 2016 (5184), and 21% higher than the same weeks last season. Norovirus activity varies from season to season, and the level of norovirus activity was lower than average during the 2015 to 2016 season. Therefore it is more appropriate to use the 5 season average for comparison. Due to this variability between norovirus seasons, it is not possible to predict how the current season will progress.
The most commonly detected norovirus strains in circulation this season belong to the Sydney2012 cluster of GII.4 noroviruses. This group of GII.4 norovirus strains have been circulating worldwide since 2012.
1.5 Rotavirus
The number of laboratory reports of rotavirus in this season* (since week 27 2016) is 2773. This is 63% lower than the 10 season average for the same period in the seasons 2003 to 2004 to 2012 to 2013 (7432)** and 55% higher than the three season average for the same period in the post-vaccine seasons 2013 to 2014 to 2015 to 2016.
In the first season following the introduction of the rotavirus vaccine in July 2013, a 77% decline in laboratory-confirmed rotavirus infections in infants was observed (Atchison et al, 2016). The total number of laboratory-confirmed rotavirus infections each season has since remained low compared to the pre-vaccine period.
There may be some fluctuation in activity due to low numbers of infections in the early part of the season when compared to the same period prior to use of the vaccine. Furthermore, most laboratory tests in use do not distinguish vaccine from wild-type rotavirus. In the post-vaccine period, further characterisation of laboratory-confirmed rotavirus infections should be considered. Broader testing of cases among eligible infants for other enteric pathogens should also be considered to avoid over-attributing rotavirus as a cause of infectious intestinal disease in young children.
1.6 All-Cause Mortality
In week 12 2017, no statistically significant excess all-cause mortality by week of death was seen through the EuroMOMO algorithm in England overall or by age group.
*In order to capture the winter peak of activity in one season, for reporting purposes, the norovirus and rotavirus season runs from week 27 in year 1 to week 26 in year 2, for example week 27 2009 to week 26 2010, July to June. Data for 2009 and 2015 exclude week 53.
**Comparison is made with this 10 season period as it is prior to the vaccine introduction.
2. Surveillance reports updated weekly
PHE syndromic surveillance page
PHE national seasonal influenza report
PHE norovirus and rotavirus: summary of surveillance
PHE weekly all-cause mortality surveillance
3. Further information
Met Office Get Ready for Winter
4. Planning resources
Cold weather plan for England