Infectious Diseases 2021

Infectious Diseases 2021

Salmonella in livestock production in Great Britain - 2020

23 September, 2021

This annual publication provides data on reports of salmonella in livestock species in Great Britain (England, Wales and Scotland) which was collected and collated by the Department for Environment, Food and Rural Affairs (Defra). Each year includes data from previous years for comparative purposes.
During 2020 there was a reduction in non-statutory surveillance and clinical diagnosis submissions in many species which was consequence of the Covid-19 pandemic and associated lockdown measures. This should therefore be borne in mind when comparing2020 data with previous years.
Salmonella in humans: In 2020, a total of 5,263 isolations of Salmonella from humans were reported; this is 45% lower than in 2019 (9,588 isolations) and 48% lower than in 2018 (10,143 isolations). 
Salmonella in Chickens: Including both NCP (National Control Programme) and non-statutory surveillance data, there were 2,221 isolations of Salmonella from chickens in 2020. This is an increase of 27.0% compared with 2019 (1,749 isolations) and an increase of 20.8% compared with 2018 (1,838 isolations).
The most commonly reported serovars were:
– Salmonella 13,23:i:- (716 isolations; 32.2% of total chicken isolations).
– S. Kedougou (430 isolations; 19.4% of total chicken isolations).
– S. Montevideo (262 isolations; 11.8% of total chicken isolations).
– S. Mbandaka (261 isolations; 11.8% of total chicken isolations).
– S. Agona (101 isolations; 4.5% of total chicken isolations).
S. enteritidis: There were 31 isolations of S. Enteritidis in 2020 compared with 48 isolations during 2019 and 27 isolations during 2018 .The most commonly reported phage type in 2020 was PT8 (22 isolations).
S. Typhimurium: There were 19 isolations of S. Typhimurium compared with 14 isolations in 2019; the most commonly reported phage types were DT2 (9 isolations) and DT193 (6 isolations). There also were 13 isolations of monophasic strains of S. Typhimurium, including four isolations of Salmonella 4,5,12:i:- (all DT193) and nine isolations of Salmonella 4,12:i:- (DT193 (x8) and RDNC (x1)). This compares with four isolations of each monophasic variant during 2019.
Salmonella in Turkeys: there were 196 isolations of Salmonella from turkeys in 2020. This is a decrease of 26.6% compared with 2019 (267 isolations) and a 60.6% decrease compared with 2018 (497 isolations). 
During 2020 the most common serovar isolated from turkeys was S. Kedougou (68 isolations; 34.7% of total turkey isolations) and the second most common serovar was S. Anatum (42 isolations; 21.4% of total turkey isolations).
There were two isolations of S. Typhimurium during 2020 (DT9 (x1) and RDNC (x1)).
The National Control Programmes (NCPs) for Salmonella (regulated serovars) in breeding flocks, laying hen flocks and broiler flocks:
EU targets of 1% for breeders, 2% for layers and 1% for broilers (0.08% for breeders, 0.35% for layers and 0.01% for broilers).
The prevalence of all salmonella serovars in laying hens was 1.06%.
Turkeys: The NCP sampling prevalence of regulated serovars was 0.00% for both turkey fatteners and turkey breeders. This is well below the EU target of 1% for each of these turkey production sectors.