Table 1.

The details of PCV2 sequences used in this study.

Accession number (total strains)	Time period (year)	Country
HQ202944-HQ202973	2001–2010	Taiwan
JF683387-JF683408, JF927976-JF927990	2002–2011	Taiwan
MF169720-MF169760	2012–2015	Taiwan
MF169660-MF169719	2016–2017	Taiwan
AB426905, AY322002, EU136711, HQ591371	2003–2010	Croatia, Denmark, France, Japan
AB462384, AF055392, AF055394, AF264042, AY035820, AY181946, AY484410, AY713470, DQ397521, EF990645, EU148503, EU148504, EU148505, EU340258, GU799576, GU808525, HM038017, HQ713495, JN006443, JX099786, JX519293, JX535296, KJ187306	1980–2013	Belgium, Brazil, Canada, China, Denmark, France, Germany, India, Japan, Netherlands, Romania, USA, Vietnam
EU450616, EU450621, GU371908, JF317586, KC620504, KC620508, KC620510, KC620554, KC620555, KJ133547, KJ408798, KM924369, KT867802, KT867921, KT868246, KX828224, KX828225, KX828226, KX828228	1970–2016	China, UK, USA, South Korea