More than two-thirds of the 650 victims, mostly female workers at Regina Miracle International Vietnam Co Ltd, were rushed yesterday to hospitals and clinics in Hai Phong City, 100 kilometres from Hanoi, Thanh Nien newspaper said.
Most of them suffered from dizziness, stomach pain and headaches after eating a lunch of rice, fish, meat, vegetables and yoghurt in the factory canteen.
"By Tuesday noon, 223 workers remained in hospital, but with minor symptoms (of food poisoning)," Pham Thu Xanh, director of Hai Phong's health care department said in an interview with state-run Vietnam Television.
Officials in Hai Phong and at the factory's Vietnam and Hong Kong offices could not be reached for comment.
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On its website Regina Miracle says it employs between 15,000 to 20,000 workers "manufacturing a variety of lingerie, shoes and sporty apparel of well-known fashion branches such as Victoria's Secret, Wacoal, Under Armour".
Food poisoning outbreaks, especially in factory canteens, have become increasingly common in Vietnam which has seen record foreign investment in recent years and impressive factory growth.
Foreign investment surged 17.4 per cent compared to last year with a record-high of USD 14.5 billion.