Winter health watch summary: 22 December 2016
Published 30 March 2017
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1. Summary
1.1 Cold Alert
All regions are currently at Level 1 – ‘Winter Preparedness and Action’.
Prior level 2 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.
1.2 Flu
During week 50 (ending 18 December 2016), the influenza season has now started with increases seen in several indicators in particular influenza-related outbreaks in the community, the proportion of laboratory samples positive for influenza in primary and secondary care and influenza-related admissions to hospital and intensive care. The Department of Health has issued an alert on the prescription of antiviral medicines by GPs.
1.3 Syndromic Surveillance
During week 50 there were further increases in GP consultations for influenza-like illness and NHS 111 calls for cold/flu, however both remain within seasonally expected levels.
Vomiting indicators have decreased slightly during week 50 but remain above seasonally expected levels in all systems.
1.4 Norovirus
Reports of suspected and confirmed outbreaks of norovirus in hospitals continue to be reported at similar levels to previous years.
The number of laboratory reports of norovirus in this season* (since week 27 2016) is 2190. This is 15% higher than the average number for the same period in the 5 seasons from season 2011 and 2012 to season 2015 and 2016 (1907), and 72% 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 and 2016. 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 1074. This is 4% higher than the 10 season average for the same period in the seasons 2003 to 2004 to 2012 and 2013 (1029)**. Rotavirus laboratory reports are currently at similar levels to previous years.
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 and considering broader testing of cases among eligible infants for other enteric pathogens are increasingly important to avoid over-attributing rotavirus as a cause of infectious intestinal disease in young children.
1.6 All-Cause Mortality
In week 50 2016, no statistically significant excess all-cause mortality by week of death was seen through the EuroMOMO algorithm in England overall and 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.
**Comparison is made with this ten 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