My guess would be however that during initial infection of a person who is immune that they may be carriers of disease who are capable of passing it on to someone who is not immune.
Since this is the case with dogs then why would it be different for people.
That is the scariest situation.
Instead of “Typhoid Mary” we get an “Ebola Bob” or somesuch...
Your first point is correct. But ‘Since this is the case with dogs’ is not true.