21. These two viruses were first differentiated by host range . 22. The natural reservoir, host range , and mode of transmission of the organism are still unknown. 23. Changes in host range have occurred frequently and independently among strains within this species complex. 24. These hosts range is sorghum, maize, and Johnson grass. 25. The host range for this virus includes species of " Atriplex ", " fodder beet. 26. Host range among the mammalian orders is non uniform.27. However, research suggests that this species may comprise several unrecognized taxa with narrower host ranges . 28. This specificity determines the host range of a virus. 29. With time, using serological, host range studies and eventually sequence data, this proved to be true. 30. These orders span viruses with varying host ranges .
