4. Discussion
This study applied real-time PCR with a TaqMan probe to quantify
CMNV in infected shrimp. The results indicate that thismethod is highly
specific for CMNV detection comparing with conventional RT-PCR and
nested RT-PCR. In this report, among the 69 shrimp samples, 21
(30.4%), and 26 (37.7%) were positive by nested RT-PCR, and real-time
RT-PCR, respectively. All of the positive samples by nested RT-PCR
were also positive by real-time RT-PCR. The detection limits of this
real-time RT-PCR were 1 copy of CMNV plasmid and 4.27 copies of clinical
shrimp sample, the correlation coefficient was high (r2 = 0.9960).
These results are similar to those reported for RT-LAMP assays for
CMNV detection, the detection limit of the RT-LAMP assaywas 27 copies
of the target plasmid (Zhang et al., 2015). This study showed that the
relative sensitivity of the CMNV real-time RT-PCR assay was slightly