"What we’ve been told by the company, by Pfizer, is that besides keeping the cold temperature, there is also a desire to limit the amount of movement because too much movement around can also cause a deterioration of the product. So that is the physical movement, shaking and agitation," Williams said. "So that’s their recommendations at this time and of course we have to follow what the company is saying. As I said before, if we are going to give the vaccine, we want to make sure it is as efficacious as possible so right now we are following the strict guidelines from the company."