Using emergency department syndromic surveillance to investigate the impact of a national vaccination program: A retrospective observational study
Fig 1
Weekly emergency department (ED) gastroenteritis visits (as a percentage of visits with a diagnosis), by age group and in total and weekly number of rotavirus laboratory isolations (England) during the two years pre-rotavirus vaccine introduction (2011 week 27–2013 week 26).
Footnote: ED: emergency department; yrs: years.