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Wiki Markup*{+}Background:+* _Salmonella enterica_ subsp. _enterica_ serovar Heidelberg (antigenic formula 1,4,\[5\],12:r:1,2) is a serovar of the O:4 (B) serogroup. _S_. Heidelberg is commonly found in poultry meat in North America. In the U.S. and Canada, it has caused numerous infections in chickens. In the U.S., this serovar has caused a number of outbreaks that included the recent outbreak (October, 2013), linked to [raw chicken|http://www.cdc.gov/salmonella/heidelberg-10-13/index.html]; this outbreak was caused by a multidrug resistant _S._ Heidelberg strain (resistant to ampicillin, chloramphenicol, gentamicin, kanamycin, streptomycin, sulfisoxazole, and tetracycline). _S._ Heidelberg accounts for the 8.6% of ceftriaxone-resistant _Salmonella_ isolated from humans in the U.S. Recently, a [phage typing scheme|http://jcm.asm.org/content/41/9/4279.full] was developed for serovar Heidelberg in Canada; this scheme recognizes 49 phage types.   

Animal reservoir: S. Heidelberg is mostly found in chickens and turkeys. 

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1. http://www.cdc.gov/salmonella/heidelberg-02-13/
2. http://www.cdc.gov/salmonella/heidelberg-10-13/index.html
3. http://jcm.asm.org/content/41/9/4279.full
4. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3569330/
5. https://www.cdc.gov/salmonella/heidelberg-11-16/index.html