http://en.wikipedia.org/wiki/Salmonella
In March 2006, The New York Times reported that the U.S. government said that 16.3% of all chickens were contaminated with salmonella. In the mid to late 20th century, Salmonella enterica serovar Enteritidis was a common contaminant of eggs. This is much less common now with the advent of hygiene measures in egg production and the vaccination of laying hens to prevent salmonella colonisation. Many different salmonella serovars also cause severe diseases in animals other than human beings.
After bacterial infections, reactive arthritis (aka Reiters Syndrome) can develop. In sickle-cell anemia, osteomyelitis due to Salmonella infection is much more common than in the general population.