Nucleic acid, specifically RNA, is extracted from the sample.
The following are listed in the CDC RT-PCR Guide:
bioMérieux
NucliSens Systems
Qiagen
QIAamp® Viral RNA Mini Kit
QIAamp® MinElute Virus Spin Kit
RNeasy® Mini Kit
EZ1 DSP Virus Kit
Roche
Roche MagNA Pure Compact RNA Isolation KIt
Roche MagNA Pure Compact Nucleic Isolation Kit
Roche MagNA Pure 96 DNA and Viral NA Small Volume Kit
Invitrogen
ChargeSwitch Total RNA Cell Kit