To use the new platform, patients would place a small sample of blood or saliva on a film made of cellulose paper surrounded by flexible plastic. Each film is designed to detect a particular type of bacteria or virus; if that type of cell is present, nanoparticles aggregate around it, dyeing the cells a bluish color to stand out from the rest of the sample. The patient would then use a smartphone app to take a picture of the sample and send it to a doctor for diagnosis. Medical professionals, no matter where they are, would receive the cell-fies and look at the bacterial biomarkers in the sample to diagnose the disease. The film is sensitive, disposable, and much cheaper to produce than similar biosensing films.