India, April 30 -- Dozens of people have been sickened and 13 hospitalized by the same strain of Salmonella infection linked to backyard poultry, according to the Centers for Disease Control and Prevention.

The CDC first reported the outbreak late last week. So far, more than 30 cases have been identified across multiple states, with several hospitalizations. In some instances, the bacteria have also shown resistance to multiple antibiotics.

As of April 23, a total of 34 illnesses had been reported in 13 states. Among the 27 cases with detailed information, no deaths have been reported. Health officials note that the true number of infections is likely higher, as many people with mild symptoms do not seek medical care.

Laboratory testing...