Wait 15 minutes contact at room temperature. Place a drop of the mixing on a Parafilm sheet. I hope I answered your questions. In either case, mixing the virus and antibody together will end up with large aggragates of virus and identification will be harder. Another method to consider is not an immuno procedure, one called pseudoreplication.
Excess stain is drained and dried then examined.
The advantage of this procedure is that any and all viruses are ID'ed and not just a single one. If you need more info, please write or call.