Salmonellosis is one of the most common zoonotic diseases in humans. The reported number of cases is lower than the actual incidence due to frequent under reporting.
The highest incidence of salmonellosis is seen after periods of high seasonal temperatures. Peak levels of Salmonella infection occur about one month after an increase in temperature.
Global Salmonella incidence
The World Health Organisation (WHO) monitors the most frequently isolated Salmonella serotypes globally. This is done by the WHO Global Salm-Serv (GSS). A global database is constrained by countries that regularly submit data on current Salmonella isolates.
Details of the system and the databases can be found on the WHO web site:
S. Enteritidis and S. Typhimurium are the most frequently isolated serotypes from all countries submitting data. The two serotypes account for 57-67% of total annual isolates.