Yellow fever virus can be transmitted from man to insect. Dengue is the most common arbovirus illness in the world. Togaviruses are non-enveloped. Rhabdoviruses have a bullet shaped morphology. Powassan encephalitis is transmitted by a tick vector.
Shingles is the result of reactivation of varicella-zoster virus from keratinocytes.
Rabies can be transmitted to humans by minimal contact with an infected bat. St. Louis encephalitis exists in a natural cycle involving small animals. Focus formation in culture. Reduced need for exogenous growth factors. RB and p53 are cellular proto-oncogenes which have been genetically linked to human cancer.