The likely reason for the delay in shipment of flu shots relates to the fact one of the strains of the flu that was included in this year's flu shot was 'hard to grow,' as was reported by a flu expert from the Public Health Agency of Canada. There has been no word about the delays from the CDC yet though.
This doesn't mean that there will be flu shot shortages this year, as doctors should get their shipments at the end of October or early November, but it is making it hard to get kids their flu shot right now.
More: Flu Season Update | Kids and the Flu | Flu Shots | Flu Symptoms
Photo (c) Mark Coffey