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Open Access Research article

Emergence of new Salmonella Enteritidis phage types in Europe? Surveillance of infections in returning travellers

Karin Nygård12*, Birgitta de Jong2, Philippe J Guerin13, Yvonne Andersson2, Agneta Olsson2 and Johan Giesecke2

Author Affiliations

1 European Programme of Intervention Epidemiology Training (EPIET)

2 Department of Infectious Disease Epidemiology, Swedish Institute for Infectious Disease Control, 171 82 Solna, Sweden

3 Department of Infectious Disease Epidemiology, Norwegian Institute of Public Health, 0403 Oslo, Norway

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BMC Medicine 2004, 2:32  doi:10.1186/1741-7015-2-32

Published: 2 September 2004

Abstract

Background

Among human Salmonella Enteritidis infections, phage type 4 has been the dominant phage type in most countries in Western Europe during the last years. This is reflected in Salmonella infections among Swedish travellers returning from abroad. However, there are differences in phage type distribution between the countries, and this has also changed over time.

Methods

We used data from the Swedish infectious disease register and the national reference laboratory to describe phage type distribution of Salmonella Enteritidis infections in Swedish travellers from 1997 to 2002, and have compared this with national studies conducted in the countries visited.

Results

Infections among Swedish travellers correlate well with national studies conducted in the countries visited. In 2001 a change in phage type distribution in S. Enteritidis infections among Swedish travellers returning from some countries in southern Europe was observed, and a previously rare phage type (PT 14b) became one of the most commonly diagnosed that year, continuing into 2002 and 2003.

Conclusions

Surveillance of infections among returning travellers can be helpful in detecting emerging infections and outbreaks in tourist destinations. The information needs to be communicated rapidly to all affected countries in order to expedite the implementation of appropriate investigations and preventive measures.