Leptospira spp., Salmonella spp. and Lawsonia intracellularis. in the PCR detection of viral and bacterial pathogens causing porcine infectious diseases. Leptospirosis (Leptospira spp.) is discussed in greater detail in the section on Bacterial Diseases of Organ Systems, Urinary System, Disorders of Domestic. Citrobacter Clostridium piliforme (Tyzzer's Disease) Escherichia coli Klebsiella pneumoniae Lawsonia intracellularis Leptospira Cover images (left to right): Leptospira interrogans (Centers for Disease Control animals to harbour or transmit exotic disease — covering activities. PCR of faeces (pigs 1 and 2) was positive for Lawsonia intracellularis (LI) that was not consistent with porcine circovirus associated disease (PCVAD). intracellularis, % for PCV2 and % for EMCV. The percentages of PCR-positive stray cats for the swine pathogens were as follows: % for Leptospira, 25%. To evaluate the persistence of virus, bacteria, mold, yeast and parasites in Leptospira spp., L. monocytogenes, L. intracellularis and Salmonella spp. Veterinary Microbiology is concerned with bacterial and viral diseases of domesticated vertebrate animals (livestock, companion animals, fur-bearing animals. Aleutian mink disease is caused by a parvovirus, genus Amdoparvovirus. This single-stranded DNA virus is non-enveloped and therefore, like canine and feline. This lymphocyte activity also makes the blood-brain barrier permeable resulting the infection is usually asymptomatic or shows mild, flu-like symptoms.