How does the HIV database classify sequences and recombinants?
We name recombinants alphabetically. If a recombinant has A, C, and H fragments, it will be labeled ACH. If it is a recombinant of a CRF and a subtype, the number precedes the letter; a recombinant between CRF01 and subtype B will be labeled 01B. Recombinants of multiple CRFs are named in the same way; a recombinant between CRF01 and CRF02 would be labeled 0102. If a recombinant contains unclassified regions, a ‘U’ will be included in the name. This topic is addressed in detail in How the HIV Database Classifies Sequences.
