Authors: Martin S Cetron; Anthony A Marfin; Kathleen G Julian; Duane J Gubler; Donald J Sharp; Rachel S Barwick; Leisa H Weld; Robert Chen; Richard D Clover; Jaime Deseda-Tous; Victor Marchessault; Paul A Offit; Thomas P Monath Journal: MMWR Recomm Rep Date: 2002-11-08