| bovine papillomavirus type 9 induces epithelial papillomas on the teat skin of heifers. | experiments were carried out to investigate whether papillomas could be induced on the teat skin of heifers by intradermal injection with bovine papillomavirus type 9 (bpv-9). three heifers (#1 and 2, two 0.5-year-old holsteins; #3, a 1.5-year-old japanese black) were injected with bpv-9 and one heifer (#4, a 0.5-year-old holstein) was mock-infected. viral dna load in the inocula was quantified by real-time polymerase chain reaction assay and adjusted to 1.56x10(12) copies per injection. papillo ... | 2009 | 19095383 |