My First Wife and I got our Flu shots on a Friday and on Monday her 3 week old cold-cough got really ugly. It is going on 7 weeks for her and 6 weeks for me.
Is a Cold also a Flu? To me the Flu is when you Puke and Poop more than normal...
Generally, from a cold the symptoms are from the neck up and from the flu are from the neck down.