At least half a dozen patients at the U-of-M medical center are being treated for critical flu sicknesses, which are  associated with the virus now called "H-1-N-1". 

You called it "swine flu" five years ago when this aggressive viral variant suddenly appeared. The world was unprepared in 2009 and there was a small pandemic.  This time, Kent County Health Department spokeswoman Lisa LaPlante tells WOOD Radio that H1N1 is included among the four strains of "the flu" that the vaccine is designed to thwart.

However, the federal Centers for Disease Control (CDC) is particularly concerned, and issued an advisory to health departments, because this aggressive flu seems to be targeting the 20-to-40 year-olds.  She said people of this age are the ones mostly likely not to be vaccinated and "they are letting the flu stick with them for a longer time before getting any kind of help."

LaPlante said "there have been deaths across the country" due to this flu.

She says the vaccination is very important to keep your from spreading thing to your friends.  

But if you do take sick with the flu, and especially if it seems more severe than times past, she advises seeing a doctor immediately.  There are medicines like Tamiflu that can attack the virus and help you deal with it.