The ISOLATE II Biofluids RNA Kit is specially developed for the rapid phenol-free isolation of high quality total RNA from biofluids and viruses. Total RNA can be purified from blood, plasma, serum and other types of biofluids such as saliva, urine, semen and cerebrospinal fluid (CSF). Viral RNA can be isolated from the same sample sources, as well as cultured cells and tissue. The kit isolates all sizes of RNA from large mRNA, viral RNA and ribosomal RNA (rRNA) down to small RNAs such as microRNA (miRNA) and short interfering RNA (siRNA).