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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