Probes are available in 2 configurations to detect both the positive (+) strand and negative (-) strand sequences:

Positive (+) strand probes– SARS-CoV-2 is a class IV RNA virus with an ssRNA genome (positive strand). The probes to detect the (+) strand will hybridize to full-length genomic (+) strand RNA as well as subgenomic (+) strand RNAs made during replication.

Negative (-) strand probes– Detection of the (-) strand is a hallmark of active viral replication. The probes to detect the (-) strand will hybridize to the full-length (-) strand as well as subgenomic (-) strand RNAs. In experimental applications where viral infection is not controlled, additional confirmation of SARS-CoV-2 presence via PCR is recommended.

NOTE: The positive (+) and negative (-) strand probes are not designed to be used in the same hybridization experiment. If co-hybridization is required for your experimental design, please contact us for a customized probe solution.

Return to FAQs main page