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If you administer a vaccine on October 15th with a 15-day withdrawal period, when is it safe to ship the cattle?

  1. October 29

  2. October 31

  3. November 1

  4. November 15

The correct answer is: October 31

When administering a vaccine that has a specified withdrawal period, it is essential to understand that the withdrawal period starts after the vaccine is administered. In this case, you give the vaccine on October 15 and a 15-day withdrawal period is required before the cattle can be shipped. To accurately calculate when it is safe to ship the cattle, you add 15 days to October 15. This means counting from October 15 up to and including the final day of the withdrawal period. November 1 marks the 15th day following the administration of the vaccine, making it the first day that it is safe to ship the cattle. While other dates might sound reasonable, they do not account correctly for the entirety of the withdrawal period ending. Therefore, November 1 is the correct date for safe shipping after adhering to the required withdrawal period.