One of the special things about this particular model is that is has two strains, with vastly different pathogenicity, these are generally reffered to as the "lethal" and "non-lethal" strains of the species.
These are generally referred to as the "lethal" and "non-lethal" strains of the species. One of the special things about this particular model is that is has two strains with vastly different pathogenicity.
One of the special things about this particular model is that is has two strains with vastly different pathogenicity. These are generally referred to as the "lethal" and "non-lethal" strains of the species.
One of the special things about this particular model is that is has two strains with vastly different pathogenicity. These are generally referred to as the "lethal" and "non-lethal" strains of the species.