Two weeks ago, a number of students and teachers of Sekolah Tuanku Abdul Rahman in Ipoh came down with a mysterious bug that turned out to be the H1N1 flu. Thus far, four people have tested positive for the virus. However, many of us remember the H1N1 pandemic of 2009 and fear a repeat of it. In today’s show, we revisit how influenza spreads and how something seemingly harmless can turn deadly.