 [ Symptoms ] do the h1n1 vaccines for children contain mercury [ Disease ] the 2009 h1n1 influenza vaccines that fda has approved will be manufactured in several formulations some will come in multi dose vials and will contain thimerosal as a preservative multi dose vials of seasonal influenza vaccine also contain thimerosal to prevent potential contamination after the vial is opened some vaccine manufacturers will be producing 2009 h1n1 influenza vaccine in single dose units which will not require the use of thimerosal as a preservative in addition the live attenuated version of the vaccine which is ok to give children which is administered intranasally through the nose is produced in single units and will not contain thimerosal