Pigs are not humans, nor even primates. They get a respiratory infection with Ebola. Primates only get a blood infection.
You cannot look at the symptoms of a disease in one species and make any conclusion whatsoever about symptoms in a different species.
An example of how viruses behave differently between species is the herpes B virus. In monkeys, it causes minimal to no symptoms. In humans, it is fatal. Researchers who work with monkeys must wear full PPE to avoid getting that disease, even if the monkeys look perfectly healthy.