Table 1.
Positive cases of tick-borne relapsing fever in Dielmo and Ndiop occurred before and during the preventive control strategy of borreliosis
| Annual monitoring | Diagnostic method | No. of borreliosis cases/village | Incidence/100 person-year | ||
|---|---|---|---|---|---|
| TBS and/or PCR | Dielmo | Ndiop | Dielmo | Ndiop | |
| 1990 (June in Dielmo) | TBS | 5 | 3.57 | ||
| 1991 | TBS | 8 | 3.63 | ||
| 1992 | TBS | 9 | 4.03 | ||
| 1993 (July in Ndiop) | TBS | 9 | 0 | 3.69 | 0 |
| 1994 | TBS | 9 | 0 | 3.7 | 0 |
| 1995 | TBS | 11 | 0 | 4.53 | 0 |
| 1996 | TBS | 44 | 0 | 16.06 | 0 |
| 1997 | TBS | 65 | 0 | 24.92 | 0 |
| 1998 | TBS | 56 | 0 | 20.35 | 0 |
| 1999 | TBS | 52 | 0 | 19.24 | 0 |
| 2000 | TBS | 55 | 0 | 19.15 | 0 |
| 2001 | TBS | 37 | 0 | 13.14 | 0 |
| 2002 | TBS | 25 | 0 | 8.93 | 0 |
| 2003 | TBS | 10 | 0 | 3.56 | 0 |
| 2004 | TBS | 21 | 0 | 6.96 | 0 |
| 2005 | TBS | 28 | 0 | 10.22 | 0 |
| 2006 | TBS | 53 | 0 | 18.73 | 0 |
| 2007 | TBS | 39 | 0 | 12.06 | 0 |
| 2008 | TBS/PCR QIAGEN (December)* | 17 | 0 | 4.77 | 0 |
| 2009 | TBS/PCR QIAGEN | 35 | 0 | 8.58 | 0 |
| 2010 | TBS/PCR POC (November)† | 36 | 5 | 9.78 | 6.04 |
| 2011 | PCR | 35 | 19 | 9.57 | 5.95 |
| 2012 | PCR | 34 | 14 | 9.08 | 4.08 |
| Total cases of any method | 693 | 38 | 10.55 | 3.79 | |
| Average annual | 31 (30.8) | 10 (9.5) | 10.55 | 3.79 | |
| January and February 2013 (before intervention) | 4 | 3 | |||
| Intervention period March 2013 (10 months) | 10 | 8 | 2.58 | 2.16 | |
| 2013 (for all cases detected) | 14 | 11 | 3.64 | 3.04 | |
| 2014 (intervention, monitoring, and tracking of risk factors) | 12 | 3 | 3.13 | 0.78 | |
| January to September 2015 (9 months) | 4 | 3 | 1.07 | 0.72 | |
| Cases during the intervention period (March 2013 to September 2015) | 26 | 14 | 2.63 | 1.39 | |
| Average cases in course of intervention‡ | 10 (10.07) | 5 (5.42) | 2.63 | 1.39 | |
PCR = polymerase chain reaction, POC = point-of-care, TBS = thick blood smear.
*
DNA extraction from patients with fever using QIAGEN columns.
†
PCR in Dielmo POC laboratory.
‡
Cases occurred in the intervention period of 2 years 7 months.