So one of the things that happens when the contact tracer calls you or visits you is they ask, "Hey, in the last certain number of days," and in the case of COVID, it would be a couple days before symptoms developed, "Hey, tell us the story of what you've been involved in doing so that we can begin to think through where you might have been, to the grocery or to church or what other activities and with whom you might have been into contact."
Algo que lleva a cabo el rastreador cuando hace una llamada o una visita es preguntar: "En los últimos tales días", en el caso de COVID serían dos días antes de la aparición de los síntomas, "cuéntenos qué ha estado haciendo para que podamos estudiar dónde ha podido ir, si al mercado o a la iglesia o a otras actividades y con quién ha podido estar en contacto".