Volume 19, Number 2, Summer 2011
1919 INFLUENZA PANDEMIC IN AUSTRALIA:
TEMPORAL AND SPATIAL SPREADS
YING-HEN HSIEH AND MEI-HUI LIN
Abstract. In 1918 Australia was the only major country to have escaped the pandemic influenza. However, after January 1919 an influenza epidemic started in Victoria and subsequently spread to all parts of Australia despite strict border control measures. Using historical weekly influenza data for each state, we construct a network graph of causality relations between the states. Our results indicate that once the epidemic established itself in Victoria, it gradually spread to New South Wales and Queensland with respective time lags of about 9–10 and 4–5 weeks, and subsequently to other states, not unlike the 2009 pH1H1 influenza epidemic in Australia.