I thought that if one person in a household got it everyone would, but like stellajane says it's not happening that way. People lock themselves away in a room to isolate when they feel unwell but they must have been contagious before the symptims showed ?
I like Dr Hillary on tv in the mornings he is so reassuring and I trust what he says, he was asked about masks today and said, the type people wear out and about are not suitable, the virus particles are so microscopic they don't stop it getting through. He also said they come in different grades, so unless everyone is issued with top grade masks it's useless wearing them.