Background: Bovine Parainfluenza Virus type 3 (BPIV3) is a major but often overlooked
pathogen that causes respiratory disease in cattle, especially during transportation and in feedlot situations.
There is a demand for the rapid detection and serological diagnosis of BPIV3 to monitor the
presence of the virus and its antibodies in cattle, which is critical in designing suitable interventions
Methods: In the present study, ssDNA aptamers with high affinity and specificity against the HN protein
of BPIV3 were selected using microplates as the matrix.
Results: After eleven rounds selection, thirty-four different DNA sequences were obtained in total,
wherein w-32, w-33, and w-34 were repeated seven, eleven, and nine times, and with Kd values of
56.57 ± 2.7 nM, 24.64 ± 2.84 nM, and 31.3 ± 3.32 nM, respectively. Two-dimensional structural
analysis showed that the three aptamers had several loop structures that were probably more energetically
favorable for target binding. Of the three candidates, aptamer w-33 showed the best affinity in an
indirect enzyme-linked aptamer assay (ELAA). The percent inhibition cutoff value of the ELAA, assessed
using twenty negative sera, was 31%.
Conclusion: In a comparative study with commercial ELISA kits, the positive detection rate of the
ELAA was slightly higher than that of the commercial ELISA kits, and the coincidence rate of ELAA
and ELISA was 88%. Further optimization of the ELAA method with more serums is needed.