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.
do the h1n1 vaccines for children contain mercury?