Epidemiology of Salmonella infections in London, 2007-2011

Synopsis

During the 5-year period, 6,332 cases of non-travel-related non-typhoidal Salmonella were reported in London.

• The number and incidence of non-travel-related non-typhoidal salmonella infections have decreased across London during this period, with the largest reduction seen in cases of Salmonella Enteritidis across all four HPUs. However, some of this decrease in non-travel-related cases may be due to an increased ascertainment of travel-related cases.
• The proportion of cases caused by S. enteritidis and S. typhimurium decreased from 71% in 2007 to 47% in 2011, but they remain the predominant serovars. 
• Incidence of non-travel related non-typhoidal salmonella was approximately 5 times higher in young children (aged 0 to 4 years) than in any other age group 
• There was wide variation in incidence of non-travel-related non-typhoidal salmonella infections by Local Authority, with inner London boroughs generally having a higher incidence.
• Ninety-five percent of typhoid cases were travel-related or had unknown travel history; India was the most commonly reported country of travel.

Last reviewed: 27 February 2013