[Simultaneous detection of enterovirus 71 and coxsackievirus A16 by multiplex real-time PCR with an internal control].
OBJECTIVE
To rapidly identify EV71 and CA16 simultaneously.


METHODS
A multiplex real-time PCR with an internal control (IC) was developed. The specificity, sensitivity, reproducibility of the real time RT-PCR assay were estimated and more over 400 clinical samples were tested.


RESULTS
The results showed 100% specificity for the selected panel. The assay met the sensitivity of 50% tissue culture infective dose (TCID50) per milliliter samples for CA16 and 0.1 TCID50 for EV71. Analysis with 10(4) - 0.1 TCID50/mL EV71 or CA16 samples demonstrated high reproducibility with a coefficient of variation (CV) of 0.9% - 2.0% for EV71 and 0.9% - 2.3% for CA16. More than 400 clinical samples were detected by real-time PCR,The results showed that the average positive ratio for EV71 and CA16 were 46.1% and 14.2%, higher than common assay (34.5% and 12.8%). Moreover, the result statistics indicated that there were PCR inhibition in stools, rectal swabs and throat swabs specimens with inhibition ratio from 1.8% to 3.4%. The inhibition ratio of these samples showed the importance of IC when PCR was used to detect the RNA of EV71, CA16 or other enterovirus.


CONCLUSIONS
As a result of its high specificity, sensitivity and avoiding false negative results by using an internal control, the assay is suitable for rapid clinical diagnosis of EV71 and CA16.
Xiao
Xinglong
X
Institut of Food Safety, Department of Food Science, College of Light Industry & Food Science, South China University of Technology, Guangzhou, China.
He
Yaqing
Y
Yu
Yigang
Y
Yang
Hong
H
Li
Huifang
H
Yang
Xiaoquan
X
Zhang
Jingwei
J
Chen
Gu
G
Liu
Dongmei
D
Li
Xiaofeng
X
Wu
Hui
H
D004770:Enterovirus / Q000302:isolation & purification*; D004769:Enterovirus Infections / Q000821:virology; D006232:Hand, Foot and Mouth Disease / Q000821:virology; D016133:Polymerase Chain Reaction / Q000379:methods; D012367:RNA, Viral / Q000032:analysis*; D011933:Reagent Kits, Diagnostic; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods*; D017422:Sequence Analysis, DNA; D014776:Virus Cultivation
D012367:RNA, Viral; D011933:Reagent Kits, Diagnostic