A considerable proportion of CRF01_AE strains in China originated from circulating intrasubtype recombinant forms (CIRF)

Table 2 Comparison of results of Chinese CRF01_AE strains intrasubtype analysis between different background areas (mainland China vs all over the world)

Background area	No. of sequences from China	Sequences inferred as recombinant	Rate
Mainland China^a	153	16	10.5 %
Worldwide^b	153	84	54.9 %

^aPerformance of intrasubtype recombination analysis of CRF01_AE sequences in mainland China under the background of mainland China, i.e., the background of 153 sequences
^bPerformance of intrasubtype recombination analysis of CRF01_AE sequences in mainland China under the background of all over the world, i.e., the background of 339 sequences

ISSN: 1471-2334