There have been no casualties as of yet, but the CDC says 21 people have been hospitalized.

No specific poultry farm, distributor, or processor has been named as a source of the outbreak. Consequently, the only advice issued by the CDC on avoiding the outbreak is to cook chicken thoroughly to destroy the bacteria.

Salmonella is common and generally harmless to adolescents and adults, but it can be serious in older people, young children, and people with compromised immune systems, such as cancer patients. The CDC said many of the patients have also had urinary tract infections.

Medical professionals are being urged to avoid prescribing the usual antibiotics for patients:

“The strain of Salmonella infantis in this outbreak is not susceptible to ciprofloxacin, ceftriaxone, or other antibiotics including ampicillin, chloramphenicol, fosfomycin, gentamicin, kanamycin, nalidixic acid, streptomycin, sulfisoxazole, trimethoprim-sulfamethoxazole, and tetracycline.

“The strain appears to be susceptible to azithromycin, amoxicillin-clavulanic acid, and meropenem.”