(CNN) A deadly strain of salmonella that has sickened more than 250 people may not respond to the antibiotics commonly prescribed to treat the foodborne infection, according to the US Centers for Disease Control and Prevention.

being hospitalized and two dying from the infection. In its Morbidity and Mortality Weekly Report published on Thursday, the CDC said that from June 2018 to March 2019, 255 people in 32 states were infected with the strain, with 60being hospitalized and two dying from the infection.

"We are continuing to see cases occurring among patients," Dr. Ian Plumb, an epidemiologist in the CDC's Enteric Diseases Epidemiology Branch and the lead author of the report, said in an email to CNN.

"The antibiotic resistance pattern of this strain is alarming because the primary oral antibiotics used to treat patients with this type of Salmonella infection may not work," he said.

The salmonella infections were linked to beef obtained in the United States and soft cheese obtained in Mexico, suggesting that this strain could be present in cattle in both countries, the CDC found. Eighty-nine of the people who contracted the infection had recently traveled to Mexico.

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