Table 3.
Environmental Factors and Case Numbers by Region
| Year | Region | Datea | RVFb | Daysc | Rainfall amountd | NDVI above average | Outbreak locations | Cases |
|---|---|---|---|---|---|---|---|---|
| 2008 | 1 | 1-Oct-08 | 1-Mar-08 | 152 | 158.00 | Yes | 12 | 135 |
| 2 | 1-Oct-08 | 14-Jan-08 | 105 | 82.43 | Yes | 15 | 328 | |
| 2009 | 3 | 9-Feb-09 | 18-Feb-09 | 9 | 20.52 | Yes | 17 | 200 |
| 2010 | 4 | 1-Oct-09 | 19-Jan-10 | 110 | 57.77 | Yes | 265 | 9824 |
| 5 | 11-Oct-09 | 15-Feb-10 | 127 | 27.60 | No | 137 | 2812 | |
| 8 | 2-Jan-10 | 10-May-10 | 128 | 12.52 | No | 9 | 37 | |
| 2011 | 6 | 15-Dec-10 | 19-Jan-11 | 35 | 32.58 | Yes | 105 | 3888 |
| 7 | 15-Dec-10 | 10-Mar-11 | 85 | 24.21 | Yes | 15 | 128 | |
| 9 | 28-Dec-10 | 4-Apr-11 | 97 | 317.32 | Yes | 2 | 73 |
a
Date daily cumulative mean rainfall exceeded average cumulative mean rainfall.
b
Date of first RVF case.
c
Days since daily cumulative mean rainfall exceeded average cumulative mean rainfall.
d
Cumulative rainfall amount above average since October 1st.
RVF, Rift Valley fever; NDVI, normalized difference vegetation index.