Salmonellosis epidemiology

Live and vector vaccine approaches should take into account the epidemiological situation and health care schemes in the target countries. The efficacy of live vaccines and vectors may be affected by a pre-existing immunity in the population. Live vaccines can also interfere with screening tests, e.g. for salmonellosis in people who handle food or for bovine leukosis in eradication schemes. 

Chen YH, Chen TP, Tsai JJ, Hwang KP, Lu PL, Cheng HH, Peng CF. Epidemiological study of human salmonellosis... 

The evolution of specific Salmonella serotypes in intensive animal husbandry and subsequently in humans has been observed over the last three decades. The most recent epidemic was caused by S. enteritidis, which peaked in humans in 1992 in many European countries. Its current slight decline sets the scene for re-emergence of S. typhimurium as - epidemiologically - the most important serotype in human salmonellosis. 

The extent of the problem is greater than it is recorded in statistics. Not all cases of salmonellosis are reported and registered, even in countries with a developed network infrastructure of epidemiological surveillance. It is estimated that only 10-20% of Salmonellosis cases are reported. 

Food-borne salmonellosis, despite considerable international publicity and concern continues to be a significant world-wide problem with little epidemiological evidence to suggest any trend towards decreased incidence. Constant or increasing patterns of outbreaks of cases over several years, for example, have been reported... 

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