Table 4.
Estimated numbers of TB cases prevented by LTBI treatment of immigrants during the first 5 years after arrival in Norway, 2008–2011
| Country of origin (WHO-estimated TB incidence rate per 100 000)* | TB notification (<40 years) | LTBI treatment (<40 years)† | Time of LTBI treatment after arrival (months) | LTBI treatment >12 months after arrival | Incident TB cases prevented by LTBI treatment‡ | Additional preventable incident TB cases if all LTBI treatments were initiated within 6 or 12 months after arrival | |||
| <6 | 7–12 | 13–60 | |||||||
| (n) | n (%) | (n) | (n) | (n) | (%) | n, range | 6 months (%) | 12 months (%) | |
| By country | |||||||||
| Myanmar (369) | 18 | 54 (21) | 23 | 15 | 16 | 30 | 3 (4–2) | 21 | 9 |
| Philippines (288) | 64 | 200 (10) | 61 | 68 | 71 | 35 | 2 (3–1) | 57 | 11 |
| Somalia (274) | 252 | 391 (19) | 64 | 113 | 215 | 55 | 19 (27–13) | 38 | 15 |
| Pakistan (270) | 12 | 16 (3) | 4 | 4 | 9 | 52 | 0.2 (0.2–0.1) | 22 | 7 |
| Ethiopia (207) | 46 | 108 (17) | 13 | 37 | 58 | 54 | 3 (5–2) | 15 | 8 |
| Afghanistan (189) | 44 | 159 (11) | 32 | 54 | 74 | 46 | 3 (4–2) | 18 | 7 |
| Thailand (171) | 20 | 53 (7) | 13 | 15 | 25 | 47 | 0.5 (0.7–0.3) | 30 | 4 |
| India (167) | 18 | 21 (3) | 6 | 8 | 7 | 33 | 0.2 (0.3–0.2) | 10 | 2 |
| Vietnam (140) | 12 | 26 (15) | 8 | 10 | 8 | 32 | 0.5 (0.6–0.3) | 99 | 4 |
| Eritrea (78) | 82 | 195 (10) | 21 | 60 | 113 | 58 | 3 (6–2) | 42 | 16 |
| Horn of Africa§ | 380 | 694 (15) | 98 | 210 | 386 | 56 | 32 (45–21) | 25 | 12 |
| Countries grouped by estimated TB incidence rate* | |||||||||
| >150/100 000 | 533 | 1193 (17) | 267 | 381 | 545 | 46 | 36 (51–24) | 30 | 10 |
| >200/100 000 | 428 | 900 (16) | 198 | 288 | 414 | 46 | 30 (42–20) | 34 | 12 |
| >200/100 000¶ | 554 | 1252 (14) | 250 | 402 | 600 | 48 | 39 (55–26) | 29 | 11 |
*From the 2014 WHO Global tuberculosis control report.6
†Percentage of LTBI-positive persons with LTBI treatment.
‡Highest and lowest estimates using the point estimate with (range) of sensitivity, efficacy and adherence estimates.
§Including Somalia, Eritrea and Ethiopia.
¶Includes countries with TB IRs >200/100 000 and Eritrea and Afghanistan (in line with the current Norwegian guidelines).
LTBI, latent tuberculosis infection; TB, tuberculosis.