Disease Detectives: Using supermarket loyalty cards to trace an E Coli outbreak
![](https://ukhsa.blog.gov.uk/wp-content/uploads/sites/33/2018/09/DD-ecoli-1024x576.png)
In November 2017, supermarket loyalty cards were used to trace the source of a large E Coli outbreak affecting mainly men in England. Find out how in this blog from our Disease Detectives series.