Factors associated with in utero or periparturient transmission of bovine leukemia virus in calves on a California dairy.
A three-year prospective study involving 143 calves born from infected cows was undertaken on a California dairy to evaluate possible factors of the dam associated with bovine leukemia virus infection in utero or during the periparturient period. In utero or periparturient infection occurred at a rate of 4.8% and was more likely in calves born to cows with an average peripheral blood lymphocyte count during pregnancy greater than 12,000 cells/microL (p = 0.043) or in calves born to cows that developed malignant lymphoma (p = 0.00004), but not in calves born to cows with p-24 antibodies (p = 0.675).
Lassauzet
M L
ML
Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California, Tulare 93274.
Thurmond
M C
MC
Johnson
W O
WO
Holmberg
C A
CA
D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D002417:Cattle; D002418:Cattle Diseases / Q000635:transmission*; D016009:Chi-Square Distribution; D005260:Female; D007938:Leukemia / Q000662:veterinary*; D001909:Leukemia Virus, Bovine / Q000276:immunology*; D007945:Leukemia, Lymphoid / Q000662:veterinary; D007958:Leukocyte Count / Q000662:veterinary; D008214:Lymphocytes; D008223:Lymphoma / Q000662:veterinary; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000662:veterinary*; D011446:Prospective Studies; D012044:Regression Analysis; D012192:Retroviridae Infections / Q000635:transmission / Q000662:veterinary*
D000914:Antibodies, Viral