Table 2. Distribution of SARS-CoV-2 Haplotypes, According to Timing of Diagnosis and Internationally Imported or Local Transmission.*.
| Haplotype | Early Targeted Testing January 31–March 15 |
Population Screening March 13–April 1 |
Later Targeted Testing March 16–31 |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Imported | Country of Origin | Local | Imported | Country of Origin | Local | Imported | Country of Origin | Local | |
| no. (%) | no. (%) | no. (%) | no. (%) | no. (%) | no. (%) | ||||
| All haplotypes | 101 (100) |
IT:42, AT:38 | 56 (100) |
16 (100) |
UK:9, US:3 | 43 (100) |
83 (100) |
AT:28, UK:23 | 278 (100) |
| A2a1 | 36 (35.6) |
IT:29, AT:3 | 16 (28.6) |
5 (31.2) |
UK:4, DE:1 | 8 (18.6) |
17 (20.5) |
AT:6, UK:4 | 51 (18.3) |
| A2a2 | 33 (32.7) |
AT:28, DK:2 | 18 (32.1) |
2 (12.5) |
US:2 | 1 (2.3) |
19 (22.9) |
AT:9, UK:5 | 28 (10.1) |
| A2a3 | 5 (5.0) |
CH:5 | 11 (19.6) |
0 | 11 (25.6) |
5 (6.0) |
ES:2 | 82 (29.5) |
|
| A2a | 19 (18.8) |
IT:11, AT:6 | 5 (8.9) |
2 (12.5) |
NL:1, DK:1 | 1 (2.3) |
30 (36.1) |
AT:13, UK:10 | 33 (11.9) |
| A1a | 2 (2.0) |
CH:1, IT:1 | 6 (10.7) |
4 (25.0) |
UK: 4 | 19 (44.2) |
4 (4.8) |
UK:2, ES:2 | 60 (21.6) |
| Other clade A | 2 (2.0) |
UK:1, AT:1 | 0 | 2 (12.5) |
UK:2 | 3 (7.0) |
2 (2.4) |
US:1, UK:1 | 19 (6.8) |
| B1a1 | 4 (4.0) |
US:4 | 0 | 1 (6.2) |
US:1 | 0 | 6 (7.2) |
US:6 | 5 (1.8) |
*
Among the imported haplotypes, each country is represented by a two-letter country code as follows: AT denotes Austria, CH Switzerland, DE Germany, DK Denmark, ES Spain, IT Italy, NL Netherlands, UK United Kingdom, and US United States. For each haplotype, the two most common countries of origin are indicated, followed by the number of participants with that haplotype.