Southern Hybridization Slot Blot
Baboon serum samples were blotted onto a nylon membrane by using a slot-blot manifold according to the protocol described by Zaaiger et al., which has a detection limit of 2.5 × 107 HBV genomes/mL (17). HBV DNA was detected by Southern blot hybridization with a 32P-labeled HBV DNA probe (HBV DNA in pBV325 vector, adr subtype).