what are the risk factors of a 78yr old male like me that does not drink except occasional dinner drink--I have shingles diagnosed on my right thigh 11-4-16 and was put on ZOVIRAX 1000 mg every 8 hours it has appararntl stopped spreading and i am scheduled for a followup with my family physician tomorrow. what should I have been doing? and is a vaccination possible.on monday -wed my thigh has been fiery red- red