Table 1.
Overview of SRLV subtypes
| Subtype | Country of origin | Species | Genomic fragments used for classification | References |
|---|---|---|---|---|
| A1 | Mexico | Goats | gag (578 bp) | 2 |
| Italy | Goats | gag (800 bp) | 63 | |
| Belgium | Sheep and goats | gag-pol (1.8 kb), pol (1.2 kb) | 97 | |
| Poland | Goats | gag (625 bp), env (~400 bp) | 125 | |
| Brazil | Goats | pol (239 bp) | 68 | |
| Iceland | Sheep | gag-pol (1.8 kb), pol (1.2 kb), RT (~300bp) | 162 | |
| A2 | Mexico | Sheep | gag (578 bp) | 2 |
| China | Sheep | Whole genome | 179 | |
| Brazil | Sheep | LTR (460 bp) | 30 | |
| Turkey | Sheep | gag (800 bp) | 111 | |
| Canada | Sheep and goats | gag (1200 bp) | 159 | |
| China | Sheep | whole genome | 177 | |
| North America | Sheep | gag-pol (1.8 kb), pol (1.2 kb), RT (~300bp) | 162 | |
| A3 | Turkey | Sheep | gag (800 bp) | 111 |
| Italy | Sheep | gag-pol (800 bp) | 15 | |
| Switzerland | Sheep and goats | gag-pol (1.8 kb), pol (1.2 kb), RT (~300bp) | 162 | |
| A2/A3 | Czech Republic | Sheep and goats | gag-pol (800 bp) | 14 |
| Spain | Sheep | gag-pol (800 bp) | 52 | |
| A4 | Switzerland | Sheep and goats | gag-pol (1.8 kb), pol (1.2 kb), RT (~300bp) | 162 |
| Germany | Sheep | gag (~400 bp) | 104 | |
| A5 | Slovenia | Sheep | gag-pol (1.8 kb), pol (1.2 kb) | 80 |
| Turkey | Sheep | gag (800 bp) | 111 | |
| Italy | Goats | gag-pol (800 bp) | 15 | |
| Poland | Goats | gag (625 bp) | 118 | |
| Germany | Sheep | gag (~400 bp) | 102 | |
| Switzerland | Goats | gag-pol (1.8 kb), pol (1.2 kb), RT (~300bp) | 162 | |
| A6 | France | Sheep and goats | RT (~300 bp) | 162 |
| A7 | Switzerland | Goats | pol (1. 2 kb) | 162 |
| A8 | Italy | Goats | gag (800 bp) | 17 |
| A9 | Italy | Sheep and goats | gag-pol (800 bp) | 15 |
| Turkey | Sheep | gag (800 bp) | 111 | |
| A10 | Italy | Goats | pol (1. 2 bp) | 144 |
| A11 | Turkey | Sheep | gag (800 bp) | 111 |
| Italy | Sheep and goats | gag-pol (800 bp) | 54 | |
| Germany | Sheep | gag (~400 bp) | 102 | |
| A12 | Poland | Sheep and goats | gag (625 bp), env (610 bp) | 119 |
| A13 | Poland | Sheep | gag (625 bp), env (~400 bp) | 125 |
| A14 | Slovenia | Goats | gag-pol (1.8 kb), pol (1.2 kb) | 80 |
| A15 | Slovenia | Sheep | gag-pol (1.8 kb), pol (1.2 kb) | 80 |
| A16 | Poland | Goats | gag (625 bp), env (~400 bp) | 128 |
| Germany | Sheep | gag (~400 bp) | 102 | |
| A17 | Poland | Goats | gag (625 bp), env (~400 bp) | 128 |
| A18 | Poland | Sheep | gag (625 bp) | 128 |
| A19* | Italy | Goats | Full genome, gag-pol (800 bp) | 15, 34 |
| A20* | Italy | Sheep and goats | gag-pol (800 bp) | 15, 34 |
| A21 | Germany | Sheep | gag (~400 bp) | 102 |
| A22 | Iran | Sheep | gag (~400 bp) | 102 |
| A23 | Italy | Sheep and goats | gag-pol (800 bp) | 15 |
| A24 | Italy | Sheep | gag-pol (800 bp) | 15 |
| A25* | Poland | Sheep | gag (625 bp) | 119 |
| A26* | Poland | Sheep | gag (625 bp), env (610 bp) | 119 |
| A27 | Poland | Goats | gag (625 bp), env (610 bp) | 122 |
| B1 | Japan | Goats | gag (~529 bp) | 79 |
| Mexico | Sheep and goats | LTR (300 bp), gag (578 bp) | 2, 96 | |
| Italy | Sheep and goats | gag-pol (800 bp) | 101 | |
| Slovenia | Goats | gag-pol (1.8 kb), pol (1.2 kb) | 80 | |
| Canada | Goats | gag (1200 bp) | 159 | |
| Belgium | Goats | gag-pol (1.8 kb), pol (1.2 kb) | 97 | |
| Philippines | Goats | partial gag | 133 | |
| U.S. | Sheep and goats | gag-pol (1.8 kb), pol (1.2 kb) | 162 | |
| Brazil | Sheep and goats | env (~400bp), gag (625 bp) | 22 | |
| Poland | Goats | gag (625 bp) | 128 | |
| France | Goats | RT (~300 bp) | 162 | |
| B2 | Spain | Sheep | gag-pol (1.8 kb), pol (1.2 kb) | 57 |
| Italy | Sheep | gag-pol (800 bp) | 15 | |
| Czech Republic | Sheep | gag-pol (800 bp) | 14 | |
| Poland | Sheep and goats | gag (625 bp) | 119 | |
| Switzerland | Sheep | gag-pol (1.8 kb), pol (1.2 kb) | 162 | |
| France | Sheep and goats | RT (~300 bp) | 162 | |
| B3 | Italy | Sheep and goats | gag-pol (800 bp) | 15 |
| B4 | Canada | Goats | gag-pol (1.8 kb), pol (1.2 kb) | 90 |
| B5 | Belgium | Goats | gag-pol (1.8 kb), pol (1.2 kb) | 97 |
| C | Norway | Sheep and goats | pol (710 bp), tat-env (2.1–2.4 kp) | 55 |
| D | Switzerland | Sheep and goats | pol (1.2 kb) | 162 |
| E1 | Italy | Goats | gag-pol (800 bp) | 63 |
| E2 | Italy | Goats | gag-pol (800 bp) | 63 |
1* – two subtypes A18 were published by two research groups. The A18 found by Colitti et al. (34) was renamed to A19, and similarly the A19 identified by them was renamed to A20. Furthermore, subtypes A23 and A24 were also defined by two research groups at the same time. The subtypes found by Olech et al. (128) were renamed from A23 to A25 and from A24 to A26