I would say that it's because of the impact of SARS, it's because of the social memory of SARS that has meant people are a little bit more selfless, and have just said, "OK, I will stay home, because I might have come in contact."
Diría que es por el impacto del SARS, es por el recuerdo social del SARS que significa que la gente es un poco más desinteresada, y solo dijeron: “Bueno, me quedaré en casa, porque podría haber entrado en contacto”.