They were rushed to the nearby Trang Bom District medical center with abdominal pain, vomiting, and diarrhea.
With their number exceeding the center’s capacity, some had to share beds or make do with stretchers and folding beds placed in corridors.
Nguyen Duc Phuoc, director of the medical center, said the patients reported they had started vomiting and experiencing abdominal pain after eating the chicken noodles.
Around 400 workers had the same meal, but only 100 have food poisoning symptoms.
"We have taken samples of the food for testing to determine the cause."
The results are awaited, he said.
A Trang Bom District official said one of the hospitalized workers is in critical condition and is on a ventilator, but the rest are stable.
Many workers were discharged after being prescribed medication.
Dechang, owned by NBDC Singapore Pte. Ltd., employs 1,200 workers and makes consumer electronic components for hair dryers, electric combs, fans, and heaters.
On May 1 over 500 people in Long Khanh City in Dong Nai suffered food poisoning after eating banh mi at a local eatery.
The cause was determined to be salmonella contamination of the ingredients.
Two severely affected children are still receiving treatment at the Dong Nai Children's Hospital and Children's Hospital 1 in HCMC.
On May 14 over 350 workers at South Korean textile company Shinwon Ebenezer Vietnam in the northern Vinh Phuc Province suffered from food poisoning after eating lunch.