Fiber optic biosensor assays for the detection of Cryptosporidium parvum oocysts. (A) Representative biosensor results using Cy5-labeled polyclonal antibody comparing signals obtained for non-boiled (control) or boiled oocysts. Replicates designated by A and B identifiers. (B) Biosensor assay using either PBS or boiled oocysts (106 oocysts/ml) to compare Cy5-labeled monoclonal or polyclonal antibodies. Error bars represent ± one SD for the mean of three assays from each waveguide.