CONCLUSION

Lentiviruses cause severe disease in some host species. The present human pandemic is, unfortu­nately, only the first stage in the evolutionary coadaptation process that is likely to have resulted in the asymptomatic nature of lentiviral infection in Old World nonhuman primates and in some nonprimate lentiviral syndromes as well.

ACKNOWLEDGMENT

I thank graduate student Dyana T. Saenz for drawing Figure 1.1.

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