Figure 2. Investigation of human and animal contact around index and suspected case-patients (S) from Mauritania in 2003. For each case-patient (represented as a box), PCR, immunoglobulin M (IgM), or isolation (Isol)-positive test results are indicated below the sample number (e.g., 169867).(a/b), no. IgM positive/no. tested; S*, suspected case-patient before field investigation and subsequently confirmed positive by laboratory tests.