Table 2. Results from the second SARS-CoV-2 point prevalence survey across the 21 participating regions/AP, Italy, 18 March 2021 (n = 1,938).
| Region | Laboratories | RT-PCR-positive | Sequenced samples | Analysed samples | Confirmed cases | Point prevalence (95% CI) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Alpha | Gamma | Beta | Alpha | Gamma | Beta | |||||
| Islands | ||||||||||
| Sardinia | 6 | 85 | 21 | 21 | 18 | 0 | 1 | 85.7% (65.4–95) | 0% (0–15.5) | 4.8% (0.8–22.7) |
| Sicily | 5 | 632 | 132 | 129 | 97 | 3 | 0 | 75.2% (67.1–81.8) | 2.3% (0.8–6.6) | 0% (0–2.9) |
| Total Islands | 11 | 717 | 153 | 150 | 115 | 3 | 1 | 76.7% (69.3–82.7) | 2% (0.7–5.7) | 0.7% (0.1–3.7) |
| South | ||||||||||
| Abruzzo | 2 | 293 | 87 | 80 | 66 | 4 | 0 | 82.5% (72.7–89.3) | 5% (2–12.2) | 0% (0–4.6) |
| Apulia | 11 | 126 | 126 | 126 | 117 | 0 | 0 | 92.9% (87–96.2) | 0% (0–3) | 0% (0–3) |
| Basilicata | 6 | 62 | 27 | 20 | 13 | 0 | 0 | 65% (43.3–81.9) | 0% (0–16.1) | 0% (0–16.1) |
| Calabria | 4 | 404 | 26 | 26 | 22 | 0 | 0 | 84.6% (66.5–93.8) | 0% (0–12.9) | 0% (0–12.9) |
| Campania | 3 | 1400 | 261 | 261 | 232 | 4 | 0 | 88.9% (84.5–92.2) | 1.5% (0.6–3.9) | 0% (0–1.5) |
| Molise | 1 | 63 | 16 | 16 | 13 | 2 | 0 | 81.2% (57–93.4) | 12.5% (3.5–36) | 0% (0–19.4) |
| Total South | 27 | 2,348 | 543 | 529 | 463 | 10 | 0 | 87.5% (84.4–90.1) | 1.9% (1–3.4) | 0% (0–0.7) |
| Centre | ||||||||||
| Lazio | 11 | 214 | 205 | 205 | 161 | 42 | 0 | 78.5% (72.4–83.6) | 20.5% (15.5–26.5) | 0% (0–1.8) |
| Marchea | 11 | 65 | Excluded from analysisa | 83.1% (72.2–90.3) | 3.1% (0.8–10.5) | 0% (0–5.6) | ||||
| Tuscany | 3 | 144 | 103 | 99 | 85 | 10 | 0 | 85.9% (77.7–91.4) | 10.1% (5.6–17.6) | 0% (0–3.7) |
| Umbria | 5 | 80 | 26 | 25 | 16 | 8 | 0 | 64% (44.5–79.8) | 32% (17.2–51.6) | 0% (0–13.3) |
| Total Centreb | 30 | 503 | 334 | 329 | 262 | 60 | 0 | 79.6% (75–83.6) | 18.2% (14.4–22.8) | 0% (0–1.2) |
| North-east | ||||||||||
| Ap Bolzano | 1 | 69 | 15 | 15 | 12 | 0 | 0 | 80% (54.8–93) | 0% (0–20.4) | 0% (0–20.4) |
| Ap Trento | 1 | 16 | 16 | 16 | 16 | 0 | 0 | 100% (80.6–100) | 0% (0–19.4) | 0% (0–19.4) |
| Emilia-Romagna | 2 | 175 | 175 | 175 | 154 | 13 | 0 | 88% (82.4–92) | 7.4% (4.4–12.3) | 0% (0–2.1) |
| Friuli Venezia Giulia | 7 | 126 | 55 | 55 | 49 | 0 | 0 | 89.1% (78.2–94.9) | 0% (0–6.5) | 0% (0–6.5) |
| Veneto | 13 | 156 | 156 | 156 | 138 | 2 | 1 | 88.5% (82.5–92.6) | 1.3% (0.4–4.6) | 0.6% (0.1–3.5) |
| Total North-east | 24 | 542 | 417 | 417 | 369 | 15 | 1 | 88.5% (85.1–91.2) | 3.6% (2.2–5.8) | 0.2% (0–1.3) |
| North-west | ||||||||||
| Aosta Valley | 1 | 32 | 2 | 2 | 2 | 0 | 0 | 100% (34.2–100) | 0% (0–65.8) | 0% (0–65.8) |
| Liguria | 8 | 179 | 22 | 22 | 14 | 3 | 0 | 63.6% (43–80.3) | 13.6% (4.7–33.3) | 0% (0–14.9) |
| Lombardy | 12 | 314 | 314 | 312 | 278 | 0 | 1 | 89.1% (85.2–92.1) | 0% (0–1.2) | 0.3% (0.1–1.8) |
| Piedmont | 16 | 155 | 153 | 153 | 138 | 1 | 0 | 90.2% (84.5–94) | 0.7% (0.1–3.6) | 0% (0–2.4) |
| Total North-west | 37 | 680 | 491 | 489 | 432 | 4 | 1 | 88.3% (85.2–90.9) | 0.8% (0.3–2.1) | 0.2% (0–1.1) |
| Total Italyb | 129 | 4,790 | 1,938 | 1,914 | 1,641 | 92 | 3 | 85.7% (84.1–87.2) | 4.8% (3.9–5.9) | 0.2% (0.1–0.5) |
CI: confidence interval; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2.
All percentages in the table are approximated to the first decimal, the value zero may therefore stand for < 0.05%. ‘RT-PCR-positive’ represent only cases tested in the laboratories involved and not all positive cases in an area.
a Marche followed a different experimental design (see Methods).
b The prevalence and totals for Italy and macro-area Centre do not include results from Marche.