I have a serious viral infection and strep. I am on prednezone since sat am for the viral and ceftin for strep since wed night. I started the ceftin and I just got worse and worse...so I went back and they told me I had this other viral infection - so the Dr. put me on prednizone (steriod) 6 pills for 2 days, 4 pills for 2 days, etc....I have been on for 2 days. I m a teacher and I want to know how long am I contagious? I have no voice. I had tightingen in my throat, dry flem, bad cough, things getting stuck when I coughed or cleared my throat - it made things worse.... my voice is getting better, but I teacher high school and I know that I will not be able to speak all day without losing my voice. I don t want to go back to school and get all the kids sick. So, when is it safe for me to go back to school?