Total DNA was extracted from the midguts, feces and hemolymph
of the BmNPV-infected and uninfected silkworm using
QIAamp DNA mini kit according to the manufacturer's protocol.
Quantity and quality of purified DNA samples were measured and
evaluated using a UV Spectrophotometer (NanoDrop2000, USA).
DNA was eluted in 50 mL elution buffer and stored at 20 C.