Mrs Heselwood, replying to a post by radio host Ryan Swain, said on Facebook: “It’s a publicity stunt - they were doing badly being criticised for their handling of this, next thing he’s in hospital in ICU - a publicity stunt for sympathy and to change the narrative. Don’t fall for it”
It sparked an angry reaction on the social media site and now the MP has issued an apology.
In a letter sent to Leeds council, she said: "I am deeply sorry for my crass and offensive comments about Boris Johnson's hospital treatment.
"I was wrong, I should never have made that claim and I apologise unreservedly.
"I wish the Prime Minister a speedy recovery and my thoughts are with him and his family at what I know is a very difficult time for them."
It is understood that the Labour party is investigating the matter.
A Labour party spokesperson said: “Leeds City Council is working round the clock in one of the country’s largest districts to respond to this global public health crisis. All Labour councillors are doing what they can to keep services running, keep people safe and support their communities.
“Julie Heselwood fully accepts her post was wrong and has apologised unreservedly for it.”
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