Health & Medical

WGS challenge on Campylobacter provides insights in Denmark

A surveillance challenge in Denmark the exhaust of whole genome sequencing has realized many Campylobacter infections will now not be sporadic and helped expose a expansive outbreak.

The gaze confirmed that roughly half of human infections belong to genetic clusters, virtually one third of clinical isolates match a chicken offer, and most expansive clusters could also furthermore be linked to poultry by WGS.

Researchers hope the determining and awareness raised will result in a decrease in the Danish chicken-associated cases of campylobacteriosis in coming years.

Denmark had 5,389 cases in 2019 and 33 p.c of passe chicken meat samples were positive for Campylobacter at slaughter. One third of infections are estimated to be tear-related.

Typing-primarily based utterly utterly surveillance of Campylobacter infections in 2019 enabled detection of expansive clusters and matched them to retail chicken isolates to react to outbreaks. Surveillance became as soon as also in a command to detect prolonged or reappearing outbreaks to aid earlier interventions, in conserving with the gaze published in the journal Eurosurveillance.

Sample findings


Scientists old WGS on 701 isolates from infected folks and 164 from chicken meat. The main focal point became as soon as on one put, northern Jutland, however isolates from Funen and Zealand were also included.

Campylobacter isolates from Danish Veterinary and Meals Administration adjust applications were sequenced and when put next with clinical isolates. New chicken and pink meat were sampled at shops in northern Jutland and at distribution centers overlaying retail chains while natural and free fluctuate broilers were sampled at slaughterhouses.

For the WGS-primarily based utterly utterly surveillance, 626 clinical Campylobacter jejuni and Campylobacter coli isolates were silent. Furthermore, 75 isolates from October 2018 thru February 2019 were included as a convention-up on an outbreak. The gaze represented 12.4 p.c of all reported cases in 2019.

Campylobacter became as soon as detected in 22 p.c of 909 retail chicken meat samples. In whole, 163 of 852 Danish-produced samples were positive as were 33 of 57 non-Danish samples.


Campylobacter became as soon as realized in 84 of 123 pores and skin samples from natural and free fluctuate broilers. A crammed with 128 isolates from meals samples and 36 isolates from adjust samples on the slaughterhouse as piece of the outbreak investigation were sequenced.

Some strains were solely newest in chicken meat or folks for a few weeks or months, whereas occurrence of different strains fluctuated over time in a single arrangement that may be related to the manufacturing cycles in every farm.

Outbreak detection


Seventy-two clusters were detected with most being diminutive at between two to four folks however 14 expansive ones fervent five to 91 sufferers.

The supreme cluster included 91 folks. It became as soon as detected on the starting of surveillance in March 2019, and persisted all thru your whole year, peaking from Can also to August. A retrospective evaluation confirmed this strain became as soon as realized in sufferers in October 2018.

The cluster matched four chicken isolates from retail meat sampled in Can also and August 2019. These isolates were traced aid to a single slaughterhouse belonging to HKScan in Vinderup. A further 30 isolates were realized: 20 from meat samples on the slaughterhouse between slack February and August 2019 and 10 from the slaughterhouse environment in slack October.

Outcomes supported a link between the outbreak strain and one farm. From August 2019, the slaughterhouse determined that meat from this farm ought to be frozen to decrease the stage of Campylobacter. It also outlined an motion opinion for optimizing procedures and tools.

A few cases with the outbreak strain were viewed in the starting of 2020 and it is doable it had unfold to multiple farms or other slaughterhouses.

Particular factors known by researchers included educate-up on every genetic cluster of Campylobacter is now not feasible thanks to the expansive quantity, which would require heaps of resources and the time deliver, as most cluster kinds like already disappeared earlier than it is doable to exhaust motion.

Furthermore, WGS-primarily based utterly utterly surveillance of human infections without the comparability to meals isolates is of puny public health payment.

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