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Case study: [2020-060] Multi-provincial outbreak of Salmonella Newport

Cluster Code: 2005NEWWGS-1ON-MP

Epidemiologic Update, May 24, 2020 as of 12:00 EDT

	Confirmed cases (n=9)
P/T Case Count	ON=6 AB=1 BC=2
Estimated Burden of Illness[1]	235
Age (years) Mean Median Range	30.4 22 17-57
Sex:  % Female	78% (7/9)
Hospitalizations	0
Deaths	0
Onset date range	April 22, 2020 – May 1, 2020
Reporting Delay (days) Median Range	21 19-26
Epidemic curve	S.  Newport cases by symptom onset and province (n=9)

 

UPDATES

Epidemiological:

 Initial exposure information is available for 7/9 cases (7 questionnaires; ON=5, BC=1)

• • 1/9 cases are lost to follow up (ON=1)
  • 1/9 cases have questionnaire pending (AB=1)

Exposure summary

• Baby spinach
  • 4/7 (57%) cases report exposure to baby spinach
• Chicken
  • 2/7 (29%) cases report exposure to chicken
    • 2 cases report purchasing from the same local butcher shop
•  Eggs
  • 2/7 (29%) cases report exposure to eggs
• Berries
  • 2/7 (29) cases report exposure to any berries
  • 1 case report exposure to blueberries
• Nuts
  • 4/7 (57%) cases report exposure to any nuts
• Seeds
  • 4/7 (57%) cases report exposure to any seeds
• Special/restricted diets
  • 3/7 (43%) cases report following a special or restricted diet
    • 1 case report following a vegetarian diet (no beef, pork, chicken)
    • 1 case report following a ‘raw food’ and vegan diet
    • 1 case report an aversion to dairy products

Laboratory:

• All confirmed cases are related by 0-6 wgMLST allele differences.

[1] Based on multiplier for Salmonella (26.1) obtained from Thomas MK, Murray R, Flockhart L, et al. Estimates of the burden of foodborne illness in Canada for 30 specified pathogens and unspecified agents, Circa 2006. Foodborne Pathog Dis 2013;10(7):639-648.