Sanofi Pasteur had used electronic patient reported outcome (ePRO) solutions provider PHT Corporation in previous trials. "eDiaries motivate subjects to complete their daily questionnaires. In addition, it is much more efficacious to ask subjects how they feel at a precise moment and get an immediate, accurate answer," said Vicki Tyler, Clinical Trial Manager at Sanofi Pasteur's Massachusetts facility, who oversees the Clostridium difficile study