Yep it seems to be contagious. If I were a practicing Jew I would have Hamsa’s all around. I’m adding that the evil eye is not limited to one religion. It’s also not limited to just men.
It also goest against the Ten Commandments though shall not covet. Like casting a evil eye on another’s “ farmers” field or anything that belongs to them.
Some Jews believe that a “good eye” designates an attitude of goodwill and kindness towards others. Someone who has this attitude in life will rejoice when his fellow man prospers; he will wish everyone well. An “evil eye” denotes the opposite attitude. A man with “an evil eye” will not only feel no joy but experience actual distress when others prosper and will rejoice when others suffer. A person of this character represents a great danger to moral purity, according to some Jews.