Investigative partners agreed to declare the outbreak over on July 7, 2020. The calculation for this date is summarized in the following figure:
Text description: Image illustrating how the date to declare the outbreak over is determined. Image begins with an epidemic curve showing case onset dates, the last of which was reported on May 19. This date is determined using the three criterion listed above. June 7th is identified as the date to declare the outbreak over.
Note that this date is not static; the date should be re-evaluated if new, relevant information comes in (e.g., case reporting increases above baseline levels in the “lag window”, CFIA reports that they have found some product on store shelves despite effectiveness checks, or new traceback information suggests other products/product lots may be contaminated).
Question 4-1: How would the date the outbreak can be declared over change if there are multiple new cases reported whose dates of onset occurred after the product was recalled?
Question 4-2: How would the date the outbreak can be declared over change if there was a new case reported after the outbreak had already been declared over?