The present disclosure provides a biosensor for the detection of protease activity. The detection of protease activity can be used for the detection of viral infection, in particular coronavirus infection. The biosensor described herein can be used to detect SARS-CoV-2. The present disclosure also provides vectors expressing the biosensor and methods for using the same.

The disclosure provides methods and compositions to digitally profile biological activity by detecting the activity of at least two biomarkers using protease activity sensors or biocomparators.

Two universally conserved sequences from influenza type A neuraminidases were identified by large scale sequence analysis then chemically modified and conjugated to carrier proteins to generate mono-specific and monoclonal antibodies. The two antibodies, one targeting the N-terminus of the type A neuraminidase and the other sequence close to enzymatic active site, were capable of binding to all 9 subtypes of neuraminidase while demonstrating remarkable specificity against the viral neuraminidase sequences since no cross-reactivity against allantoic proteins was observed. Quantitative analyses of NA using slot blot suggest that the antibodies can be used for NA antigen quantitation in vaccines. These represent the first time the antibody-based immunoassay can be used for NA quantitative determination.

Two universally conserved sequences from influenza type A neuraminidases were identified by large scale sequence analysis then chemically modified and conjugated to carrier proteins to generate mono-specific and monoclonal antibodies. The two antibodies, one targeting the N-terminus of the type A neuraminidase and the other sequence close to enzymatic active site, were capable of binding to all 9 subtypes of neuraminidase while demonstrating remarkable specificity against the viral neuraminidase sequences since no cross-reactivity against allantoic proteins was observed. Quantitative analyses of NA using slot blot suggest that the antibodies can be used for NA antigen quantitation in vaccines. These represent the first time the antibody-based immunoassay can be used for NA quantitative determination.

The disclosure provides methods and compositions to digitally profile biological activity by detecting the activity of at least two biomarkers using protease activity sensors or biocomparators.