Secondary antibodies are labeled with fluorochrome instead of primary antibodies. The fluorescent secondary antibodies are observed to bind to unstained primary antibodies. 

 Identifying disease-causing microbes by observing whether certain antibodies bind to them.

Immunofluorescence

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

Primary antibodies labeled with fluorochrome stain specific antigens bind directly to targeted pathogen, if present.

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