APPLIED ANIMAL BEHAVIOUR SCIENCE AN INTERNATIONAL SCIENTIFIC JOURNAL REPORTING ON THE APPLICATION OF ETHOLOGY TO ANIMALS USED BY MAN, cilt.258, ss.1-6, 2023 (SCI-Expanded)
Medical detection dogs have a high potential for use as alternative diagnostic tools not only for organic diseases,
but also for infectious diseases. However, new variants emerging over time may affect the accuracy and sensitivity
of diagnostic methods including medical detection dogs in case of viral pandemics. To the best of our
knowledge, this is a pioneer study aimed to investigate diagnostic performances and generalization ability of
SARS-CoV-2 detection dogs against the new variant after being trained with the original virus. Two SARS-CoV-2
detection dogs were used in this study. In total, 1002 samples including the Omicron variant were introduced to
the dogs using a double-blinded design. Two different refresher training sessions were conducted to train the
dogs to identify the scent of the Omicron variant. In the first refreshment training, mixed samples (original virus
and Omicron variant) were used. The diagnostic performances of the dogs were significantly increased only after
the second refreshment training where only the Omicron variant was introduced. This study illustrates that
diagnostic performances of SARS-CoV-2 detection dogs were not consistent over time with the emerging new
variants. Thus, refreshment training with new variant(s) should be conducted with every new variant which may
affect the diagnostic performances of those dogs in such infectious outbreaks.