Contagion and Unchained Diseases.

[Randolfin]

Contagion:

The subject contracts one of the following diseases: blinding sickness, bubonic plague, cackle fever, filth fever, leprosy, mindfire, red ache, shakes, or slimy doom. The disease is contracted immediately (the onset period does not apply). Use the disease's listed frequency and save DC to determine further effects. For more information see Diseases.

As far as I understand, your victim rolls save DC against "Contagion". If he fails he gets the disease you choose and rolls a save against the disease right?

Now how does this work with Unchained Diseases?

They got rid of the onset period and replaced it with the "Latent/Carrier" Stage.

If I now use "Contagion" on someone and he fails the DC against the spell, he would be in the "Latent/Carrier" Stage right? Would he then have to roll against the Disease DC immediately to not go to the "Weakened" stage? Or would he just get the "Latent/Carrier" Stage from "Contagion" and thats it?

[Revan]

As I recall, the Latent/Carrier stage is equivalent to the onset period--a state you would normally enter after failing the first save, but before any symptoms--I.e., debilitating effects--develop. So if Contagion skills the over period, it should go straight to the next stage.

[Yogmoth]

Dot

[Framane]

We played it by skipping the Latent/Carrier stage too, as this would come the closest to mimicking how contagion works without the alternate rule.