Paper-based biosensors are a subset of paper-based microfluidics used to detect the presence of pathogens in water. Paper-based detection devices have been touted for their low cost, portability and ease of use. Its portability in particular makes it an good candidate for point-of-care testing. However, there are also limitations to these assays, and scientists are continually working to improve accuracy, sensitivity, and ability to test for multiple contaminants at the same time.