title: Microtiter plate assays for the measurement of phage adsorption and infection in Lactococcus and Enterococcus.
abstract: Three easy and rapid microtiter plate assays for determining phage sensitivity of lactococci and enterococci have been developed. In the microlysis assay, the degree of sensitivity was measured on the basis of the ability of the bacterial cells to grow in the presence of various concentrations of phage and to effect a color change of an acid-base indicator as a result of acid production. Two assays that specifically measure phage adsorption to bacterial cells have been developed on the basis of the enzyme-linked immunosorbent assay (ELISA) technique. In the direct phage adsorption ELISA, adsorption of phage particles to cells immobilized onto microtiter plate wells was measured using specific anti-phage antibody. In the competitive phage adsorption ELISA, phage adsorption was assayed by allowing phage to compete with specific antibody binding to the bacterial cell surface. All three assays were quantifiable photometrically.
authors.affiliation: Department of Microbiology, NYS College of Veterinary Medicine, Ithaca.
authors.forename: M L
authors.initials: ML
authors.lastname: Tortorello
authors.forename: K M
authors.initials: KM
authors.lastname: Trotter
authors.forename: S M
authors.initials: SM
authors.lastname: Angelos
authors.forename: R A
authors.initials: RA
authors.lastname: Ledford
authors.forename: G M
authors.initials: GM
authors.lastname: Dunny
mesh_terms: D000327:Adsorption; D001435:Bacteriophages / Q000502:physiology*; D003124:Colorimetry; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D013291:Streptococcus / Q000254:growth & development*