ABC News' Sunlen Miller Reports: On the first day of National Preparedness Month, President Obama cautioned that people “not be alarmed” but be prepared” for the second wave of the H1N1 virus this fall and gave a brief update on the administration’s efforts. “We know that we usually get a second, larger wave of these flu viruses in the fall, and so response plans have been put in place across all levels of government,” Mr. Obama said from the Rose Garden this afternoon, “Our plans and decisions are based on the best scientific information available, and as the situation changes,...