Virological Studies At the first study visit, the lower palpebral conjunctiva of each eye will be rubbed six to eight times using the Rapid Pathogen Screening (RPS) Adeno Detector Plus Immunoassay device. A positive result in the most involved eye is required to meet entry criteria. For patients entered and randomized into the treatment or placebo arms, further virologic studies for quantitative culture, PCR confirmation and viral serotyping using DNA sequencing will be performed,