| Country | Authors | VIC frequency (%) | |
| Togo | KokouOutcha [10] | 24.4 | |
| Sénégal | Acrachi [9] | 38 | |
| Burkina-Faso | Kinda [4] | 23.33 | |
| France | Joly et al. [16] | 30 à 40 | |
| Etats-Unis | Sables [19] | 30 | |
| Mali notre étude | Mariko S | 75 | |