Norovirus Outbreak Report 2011/12 - The Royal Wolverhampton ...

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The Royal Wolverhampton Hospitals NHS TrustFigure 1. Epidemic curve during Ward D7 outbreak by onset of il lness,January 2012 (n=28).The quick rise in symptomatic patients followed by a gradual reduction in cases ofdiarrhoea and vomiting shown in the outbreak curve is indicative of a single source ofexposure. The outbreak lasted 6 days, affected 20 patients and 8 staff, and was containedto a single ward.Reports to HPA Laboratory of Norovirus infections in England and Wales reveal thatFebruary 2012 observed the highest level of Norovirus activity since January to March2010. During this month the largest outbreak of the year for the Trust occurred, beginningon 8 th February.Figure 2. Epidemic curve during outbreak by date of onset, February toMarch 2012 (n=214).The outbreak lasted for 30 days, with 13 outbreaks over 12 wards ensuing. 125 patientswere affected and 25 staff were symptomatic on wards. The outbreak was likely to be
The Royal Wolverhampton Hospitals NHS Trustpropagated (person-to-person spread), illustrated by the number of wards involved andseveral peaks on the epidemic curve (Figure 2). This could be explained by staff reportingback to work to early following illness or be due to visitors becoming symptomatic whilstvisiting the hospital and vomiting on site of which there were several reports. The outbreakwas declared over on 9 th March 2012.Figure 3. Epidemic curve during outbreak by date of onset, March to April2012 (n=118).Between 30 th March 2012 and 24 th April 2012 there was reporting of diarrhoea and vomitingon 9 different wards. This outbreak displayed similar characteristics to its predecessor.Progressively taller peaks in the epidemic curve (Figure 3) illustrates the virus was likelyspread by symptomatic staff and patients throughout the hospital after the index case wasadmitted.For this outbreak a slightly shorter outbreak length of 25 days resulted in 119 beds blockedover the period. 55 patients were affected and 31 staff were symptomatic on wards.The onset date of the last outbreak of the year was 14 th May 2012, lasting for 15 days until29 th May 2012. The number of patients with symptoms of diarrhoea and vomiting was 19. Intotal 50 bed days were lost due to blocked beds, but the outbreak was successfullyconfined to one ward.
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