| germany | | ecotropic murine leukemia virus | no rank | 1 | 0 |
| germany | | polytropic murine leukemia virus | no rank | 1 | 0 |
| thailand | | xenotropic murine leukemia virus | no rank | 1 | 0 |
| united states | | mlv-related virus cfs | no rank | 9 | 0 |
| united states | | xenotropic murine leukemia virus | no rank | 2 | 0 |
| united states | california | amphotropic murine leukemia virus | no rank | 1 | 0 |
| united states | california | murine leukemia virus case#1 | no rank | 2 | 0 |