Can one or more people in a home have scabies and others not be infected. with no signs or symptoms months after first person showed signs.

Possible.: Scabies is highly contagious, but spreading requires skin-to-skin contact. If you have had no direct contact with the infested person(s), it is possible to avoid infestation. But we usually recommend that all household members use Permethrin at least once if anyone in the house is infested. This assumes, of course, that the correct diagnosis was made, by a dermatologist or other experienced md.