Submitted to: Research Workers in Animal Diseases Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 10/15/1997
Publication Date: N/A
Technical Abstract: Eight distinct strains of chlamydia were isolated from three herds. The isolates were from normal pigs, from pigs with conjunctivitis, and from pigs with pneumonia, conjunctivitis, and enteritis. The goal of the research was to determine the relationship of the swine strains with chlamydial isolates from other animals and humans. The isolates were characterized by sequence analysis of the major outer membrane protein gene, accumulation of glycogen in inclusions, and resistance to tetra- cycline and sulfadiazine. The sequence analysis proved the isolates were similar to, but not the same as, human Chlamydia trachomatis strains. All of the strains were found to accumulate glycogen in inclusions, a characteristic of C. trachomatis strains. However, a number of the isolates were highly resistant to sulfadiazine and tetracycline, perhaps due to the wide-spread use of these drugs as feed additives in the past. The results demonstrate that swine are infected with numerous strains of chlamydia and the strains are of the C. trachomatis type.