Study design for animal-to-animal transmission

YK Young-Il Kim
KY Kwang-Min Yu
JK June-Young Koh
EK Eun-Ha Kim
SK Se-Mi Kim
EK Eun Ji Kim
MC Mark Anthony B. Casel
RR Rare Rollon
SJ Seung-Gyu Jang
MS Min-Suk Song
SP Su-Jin Park
HJ Hye Won Jeong
EK Eung-Gook Kim
OL Ok-Jun Lee
YK Yong-Dae Kim
YC Younho Choi
SL Shin-Ae Lee
YC Youn Jung Choi
SP Su-Hyung Park
JJ Jae U. Jung
YC Young Ki Choi
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To study the animal-to-animal transmission of SARS-CoV-2 by age, we intranasally inoculated SARS-CoV and SARS-CoV-2 antibody-free female ferrets with 105.8 TCID50 of SARS-CoV-2. Three ferrets were infected per group (juvenile, young adult, and aged). At 24 h post-infection, SARS-CoV and SARS-CoV-2 antibody-free female naive ferrets (n = 3, 12–24 month old) were introduced into direct contact (same cage) with each group of infected ferrets. Clinical signs of infection were assessed and nasal washes and rectal swabs were obtained every day until 11 days post-contact. Blood was collected from contact ferrets to evaluate serum IgG antibody titers at 12 and 21 days post-contact.

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