They are contagious from just BEFORE the tingling starts until a scab forms.
More bad news- asymptomatic viral shedding can also occur- some people can shed the virus without having a cold sore 
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For me there is only the traveling on paths that have heart, on any path that may have heart. There I travel, and the only worthwhile challenge is to traverse its full length. And there I travel, looking, looking, ...breathlessly.
-Carlos Castaneda
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