Molecular investigation of Coxiella burnetii in the Middle and East Black Sea region in aborted bovine fetuses and investigation of the oxidant/antioxidant system.

Coxiella burnetii (C. burnetii) is a causative microorganism that causes the zoonotic Q fever disease, which is generally asymptomatic in animals, but causes reproductive issues such as abortion, stillbirth, and infertility. C. burnetii infection poses a threat to farm economies as it affects productivity in farm animals. The purpose of this research was to look into the incidence of Q fever in eight provinces in the Middle and East Black Sea region and to measure reactive oxygen and reactive nitrogen species as well as antioxidant levels in bovine aborted fetal livers infected with C. burnetii. The study material consisted 670 bovine aborted fetal liver samples delivered to Samsun Veterinary Control Institute from eight provinces between 2018 and 2021. C. burnetii was analyzed by PCR in these samples and 47 (7,01%) were positive while 623 negative. Nitric oxide (NO), malondialdehyde (MDA) and reduced glutathione (GSH) activities were analyzed by spectrophotometric method in both 47 positive samples and 40 negative samples as control group. In the C. burnetii positive and control groups, MDA levels were determined to be 2.46 ± 0.18 and 0.87 ± 0.07 nmol/ml, NO levels were determined to be 1.77 ± 0.12 and 1.09 ± 0.07 nmol/ml, and reduced GSH activity was determined to be 5.14 ± 0.33 and 6.62 ± 0.46 µg/dl, respectively. In C. burnetii positive fetal liver tissue, MDA and NO levels were higher than the control group, while reduced GSH levels were lower than the control group. As a result, C. burnetii caused changes in free radical level and antioxidant activity in bovine aborted fetus liver.