Giardia is a painful stomach bug (Image: Getty) The death of two children, aged five and six , has sparked concern over a giardia outbreak as the youngsters both attended Millstead Primary School in Everton, which is currently dealing with an outbreak of cases of the infection. The UKHSA has said the causes of the deaths of the two children are unconfirmed, but "unlikely to be due to giardia", according to the Liverpool Echo. But millions of parents and families throughout the UK will be looking to prevent a further spread of the nasty stomach bug.

Express.co.uk takes an in-depth look at what giardia is, how it can be caught, the symptoms and how it can be treated.

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