How do you catch roseola infantum?

Roseola. Two common and closely related viruses can cause roseola: human herpesvirus (hhv) type 6 and possibly type 7. These viruses belong to the same family as the better-known herpes simplex viruses (hsv), but hhv-6 and hhv-7 do not cause the cold sores and genital herpes infections that hsv can cause.