Capsid Gene Divergence of Black Queen Cell Virus Isolates in Thailand and Japan Honey Bee Species.

Black queen cell virus (BQCV) has been found in honey bees worldwide. By using the reverse transcription polymerase chain reaction (RT-PCR) technique, BQCV was detected in a non-native species, Apis mellifera L., collected in both Thailand and Japan, and three other honey bee species (Apis cerana indica F.