A boy was left hallucinating and vomiting after he was bitten on the bum by a false widow spider.
Bear Styles, eight, put on his swimming trunks that he left out on the patio to dry before taking a dip in his family's swimming pool on July 21.
The deadly spider was hiding inside his shorts and sunk its fangs into his right bum cheek.
The eight-legged terror tried to run off when dad Vinny Styles shook the swim shorts off, but mum Dawn Styles managed to take a snap of 50p-sized spider.
At first, Bear felt fine and even jumped in the pool to play with his dad and siblings, but 40 minutes later he became extremely pale, felt sick and his temperature shot up to 39.2C degrees.
The couple, who are trained in first-aid, decided to call 111 where an operator advised them to take Bear to the hospital.
During the car journey to Peterborough City Hospital, Bear started hallucinating, telling his parents he could see Disney Pixar characters in the trees.
Hosptial staff carried out multiple tests and confirmed Bear was suffering from a reaction from a noble false widow spider.
Dawn, a doula, is now warning others to shake out clothes that have been left outside before wearing them.
Dawn, Cambridgeshire, said: "We've got a really big 18-foot pool in the garden, which we put up every year over the summer.
"The kids absolutely love it, they go in every day. My husband had just got in from work at around 7pm and they were getting ready to get in.
"As they go in every day, the kids leave their wet stuff slung over a chair in the garden or on the patio to dry.
"Bear went out and put his shorts on, obviously he didn't shake them or anything, and then he came in and said 'something's bit my bum'.
"He quickly whipped them off and I called my husband over. He picked up the shorts, shook them and a spider dropped out."
Bear then splashed around in the pool with sales manager dad Vinny, 47, and siblings Forrest Styles, 19, Finlay Styles, 16, and 15-year-old Feather Styles before getting out.
Dawn, 42, said: "After he got out of the pool he went really white, his lips were pale and he said he felt sick.
"I sat with him on the sofa and he felt steaming hot but his hands and feet were really cold. We took his temperature and it was 39.2 degrees, he had chills and was shaking.
They called 111 and were told to immediately go to the hospital.
She continued: "It's a 35-minute journey to the hospital, and as I was driving him there he started hallucinating. He really likes Disney Pixar Cars and he was saying 'I can see Mater in the trees'.
"Every few breaths he'd take a really big breath like he couldn't quite catch his breath. I had to help him walk into the hospital."
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Once they arrived, Bear started vomiting, he became drowsy with a headache while his temperature remained high.
Dawn said she showed the doctor a picture of the spider and they consulted with someone from the poisons department, who confirmed it was a noble false widow.
Bear underwent an ECG and blood tests before being discharged at 3.30pm the following day.
The doctor looking after Bear requested that they log his bite in their journal, so other professionals can learn from his experience.
Dawn said that Bear, who has autism, was shattered when they got home but has now recovered.
Dawn said: "Autistic people tend to feel pain and experience illness in a different way to neurotypical people.
"Often they don't really feel certain pain in the same way and other things they can over-feel."
Dawn is now urging families to be vigilant and thoroughly check any clothing left outside for critters before wearing them.
Dawn said: "It's made us all really think a bit more carefully [about checking clothing]. We inspect everything, even if it's been hanging on the line.
"What we don't want is to make people more scared of spiders and kill them - spiders are beautiful. Bear wants a tarantula as a pet, that's how much he loves spiders.
"We don't want people to think they have to kill every single spider that they see.
"Just be mindful of where they might be and shake things off - [if people come across them] take them outside rather than killing spiders.
"If someone is bitten, go and seek medical treatment."
