1m ago12:54
'Within the Countess of Chester Hospital, a poisoner was at work'
Opening for the prosecution, Mr Johnson begins by describing the Countess of Chester hospital.
"It's a hospital like so many others in the UK," he tells the court.
"But unlike many other hospitals in the UK and unlike many other neonnatal units in the UK, within the neonatal unit in the Countess of Chester a poisoner was at work."
He then cites the infant mortality rates - which saw a "significant rise" in the number of babies dying, and serious or catastrophic collapses.
Some of the collapses and recoveries "defied" treatment expectations, he says.
"Babies who had not been unstable at all suddenly severely deteriorated.
"Sometimes babies who had been sick and then on the mend deteriorated for no apparent reason.
"Having searched for a cause, which they were unable to find, the consultants found the inexplicable collapses and deaths did have one common denominator.
"The presence of one of the neonatal unit nurses.
"That nurse was Lucy Letby."
Latest updates on day four of the Lucy Letby trial, with the prosecution showing the court handwritten "confessions" from the nurse in which she allegedly admitted she was "evil", and the defence saying the hospital was "well out of its depth". Letby denies all charges.
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