Goku's Heart Disease

[Silver Sinspawn]

Was this proven, or was that just what Yamcha thought?

[Piccolo Daimaoh]

Was this proven, or was that just what Yamcha thought?

He was told that so I think that it's safe to assume that he was telling the truth.

[Silver Sinspawn]

By who?

Unless it was Trunks, I doubt they would know.

[Rocketman]

What makes you guys think its a contagious disease? Maybe its like cancer. Possibly he was born with it. Possibly its genetic.

It's a virus. Viruses are not at all like cancer and aren't spawned from one's own genes, and you can't be born with them unless your mom had it, and in that case it's unlikely it'd wait around for thirty years to activate.

[Bussani]

Was this proven, or was that just what Yamcha thought?

There's absolutely no reason to believe that the author added that comment just to make the reader think the opposite of what he intended.

[Xyex]

Amazing how some virus from halfway across the galaxy is compatible with Goku when Earth viruses can't even infect all forms of life on Earth.

HIV started out in monkeys, then moved to people. There are plenty of other diseases on this planet that originated within one species, then adapted to work in another. The are others that work in more than one species. The rarity of space viruses that affect Saiya-jins/Earthlings is probably the only reason the entire world didn't die from a swarm of mega-plagues by the end of GT.