New Variant Of Salmonella ST34 Strain Causing New Outbreak In The U.S.

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Scientist are suspecting that a new variant of the Samonella ST34 strain which is already a new strain of Salmonella that arose as a result of the Salmonella Typhimurium strain acquiring a genetic material from a bacterial virus or bacteriophage called the mTmV virus. 

https://www.microbiologyresearch.org/content/journal/mgen/10.1099/mgen.0.000456

The US. CDC has issued a notice with regards to this new Salmonella multistate outbreak since the 9th of June. https://www.cdc.gov/salmonella/backyardpoultry-06-22/index.html

Europe

As of 3 June 2022, 392 confirmed (n=370) and probable (n=22) cases of monophasic S. Typhimurium have been identified in the EU/EEA and the United Kingdom. In addition, cases have been identified in Canada (n=4), Switzerland (n=48), and the United States (n=1), bringing the total number of cases to 445 globally.

Number of confirmed and probable cases with monophasic S. Typhimurium infection by country, EU/EEA and the UK - 3 June 2022
 Number of confirmed and probable cases with monophasic S. Typhimurium infection by country, EU/EEA and the UK.

This outbreak is characterised by a high proportion of hospitalised (about 40%) cases and some cases with severe clinical symptoms such as bloody diarrhoea.

Based on epidemiological and microbiological investigations, specific chocolate products from a Belgian chocolate factory have been identified as likely vehicles of infection.

Affected cases were identified through advanced molecular typing techniques. As this method of testing is not routinely performed in all countries, some cases may be undetected.

The factory was closed on 8 April 2022 (week 14) and product recalls were launched globally. The recalls aim to prevent the consumption of products potentially contaminated with Salmonella. As a result of control measures, the number of cases has started to decline.

Further investigations are being conducted by public health and food safety authorities in countries where cases are reported, to identify the cause and the extent of the contamination, and to ensure contaminated products are not put on the market. 

Table 1. Number of confirmed and probable cases of monophasic S. Typhimurium in the EU/EEA, the United Kingdom, Canada, Switzerland and the United States, as of 3 June 2022

CountryConfirmed casesProbable casesTotal number of cases
Austria14014
Belgium521466
Denmark404
France1180118
Germany30535
Ireland17017
Italy101
Luxembourg202
Netherlands303
Norway101
Spain235
Sweden404
Total EU/EEA24822270
United Kingdom1220122
Total EU/EEA and UK37022392
Canada404
Switzerland48048
United States101
Total42322445

Figure 1. Distribution of confirmed and probable monophasic S. Typhimurium cases by week-year in 12 EU/EEA countries and the UK, as of 3 June 2022

Figure 1. Distribution of confirmed and probable monophasic S. Typhimurium cases by week-year in 12 EU/EEA countries and the UK, as of 3 June 2022
 Figure 1. Distribution of confirmed and probable monophasic S. Typhimurium cases by week-year in 12 EU/EEA countries and the UK, as of 3 June 2022


 

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