| 1 | Cameroon and Chad have not reported any cases. | |
| 2 | That area starts in Afghanistan, it includes Iraq, Palestine, Sudan, Chad and Somalia. | |
| 3 | Some of the faces we climbed in Chad in the Ennedi desert have never been attempted before. | |
| 4 | This law was a deciding factor in the World Bank Group' s original support for the Chad-Cameroon Oil Pipeline. | |
| 5 | Travelers to Chad who have in the past received three or more doses of OPV should be offered another dose of polio vaccine before departure. |