Abstract: A DNA probe and method for detecting Campylobacter jejuni, which consists essentially of a DNA sequence that is:a) derived from a chromosomal sequence of a bacterium of the species C. jejuni or C. coli but is less than the entire chromosomal sequence of that bacterium;b) capable of hybridizing to DNA of at least 80% of bacteria that are in the species C. jejuni and/or C. coli; andc) not capable of hybridizing to DNA of bacteria that are not in the genus Campylobacter. The method features detecting C. jejuni in a sample by providing at least one probe capable of selectively binding to C. jejuni but not bacteria that do not belong to the genus Campylobacter, contacting that DNA probe with bacteria in the sample under conditions that allow the probe to hybridize to C. jejuni in the sample thus forming hybrid DNA complexes, and detecting the hybrid complexes as an indication of C. jejuni in the sample.

Abstract: A DNA probe and method for detecting Campylobacter jejuni, which consists essentially of a DNA sequence that is:(a) derived from a chromosomal sequence of a bacterium of the species C. jejuni or C. coli but is less than the entire chromosomal sequence of that bacterium;(b) capable of hybridizing to DNA of at least 80% of bacteria that are in the species C. jejuni and/or C. coli; and(c) not capable of hybridizing to DNA of bacteria that are not in the genus Campylobacter. The method features detecting C. jejuni in a sample by providing at least one probe capable of selectively binding to C. jejuni but not bacteria that do not belong to the genus Campylobacter, contacting that DNA probe with bacteria in the sample under conditions that allow the probe to hybridize to C. jejuni in the sample thus forming hybrid DNA complexes, and detecting the hybrid complexes as an indication of C. jejuni in the sample.

Abstract: Recombinant DNA vector including (1) a promoter for a eukaryotic metalliothionein gene ligated to a gene sequence encoding hepatitis B surface antigen, and (2) at least the 69% transforming region of the bovine papilloma genome, expression of the hepatitis B surface antigen encoding gene sequence being under the control of the metallothionein promoter.

Abstract: Method of detecting the presence of Salmonella in a food sample including providing at least one DNA probe which is capable of selectively hybridizing to Salmonella DNA to form detectable complexes, contacting the DNA probes with the bacteria in the food sample under conditions which allow the probe to hybridize to Salmonella DNA present in the food sample to form hybrid DNA complexes, and detecting the hybrid DNA complexes as an indication of the presence of Salmonella in the food sample.