The authors conclude that cats are highly susceptible to subclinical infection, with a prolonged period of oral and nasal viral shedding, that is not accompanied by clinical signs. The study again shows that cats can become infected through direct contact with other infected cats. The authors also state that cats develop a robust neutralizing antibody response that prevented re-infection to a second viral challenge.
The dogs in this study did not appear to shed virus but did mount a low-level antibody response.
This is another study that has been made available on bioRxix before peer review. It should be remembered that this study reports on experimental infection in laboratory bred (and pathogen free) animals, this will not be the case with domestic cats where secondary infections may explain clinical signs.