More than 160 people who ate at a kebab shop were struck down with food poisoning in one of London's largest outbreaks in recent years.
Customers of A1 Kebabish, in Manor Park, east London, needed urgent hospital treatment.
Environmental health officers have closed the shop for one month and confirmed 60 cases of Salmonella.
Newham Hospital said there were so many cases ambulances had to be diverted to other A&Es on 13 February.
Newham Council said it was unknown if bad meat was the cause. It is considering legal action.
A council spokeswoman added the shop owners were co-operating fully with the investigation and have implemented health officers' recommendations. The takeaway shop reopened this week.
Katherine Lewis, of the Health Protection Agency, said: "We are testing samples to see what sort of Salmonella is behind this."
Customer Nitin Majevadia who went to hospital three times after eating food from the takeaway said the shop should not have reopened.
"I don't think they should be providing food for the community because the sheer number of people they put in hospital is ridiculous," he said.
The 33-year-old IT manager from Manor Park, London, was off work for three weeks and lost more than a stone in weight after he ate chicken, chick peas, potatoes and salad with chilli sauce.
"I had severe diarrhoea, vomiting, fever and cold sweats plus waves of pins and needles all over my body."
A spokesman from Newham University Hospital said 154 people attended the hospital between 11 and 14 February with symptoms of food poisoning.
"The majority of these patients were treated and discharged but 11 patients needed further treatment," he said.
Al Kebabish spokesman Afzal Mohammed said he did not know what caused the outbreak.
"Our shop is clean, all our customers have returned," he said.
"We have been in this business for eight years and we are still busy."
Ian Walker, partner at London personal injury law firm Russell Jones and Walker, said he was representing four customers seeking compensation.