Dynavax Technologies Corporation announced that it has received a Complete Response Letter (CRL) from the U.S. Food and Drug Administration (FDA) regarding its Biologics License Application (BLA) for HEPLISAV-B™ [Hepatitis B Vaccine, Recombinant (Adjuvanted)] for immunization of adults 18 years and older against hepatitis B infection. The FDA issues CRLs to communicate that the Agency has completed a review cycle of an application and to request additional information for review and approval. Dynavax expects a Class 2 designation for a resubmission of the BLA, which would result in a target review period of six months.