5 n-count A medium is a substance or material which is used for a particular purpose or in order to produce a particular effect. Blood is the medium in which oxygen is carried to all parts of the body..., Hyatt has found a way of creating these qualities using the more permanent medium of oil paint.
An influenza pandemic is a global outbreak of disease that occurs when a new influenza A virus appears or âemergesâ in the human population, causes serious illness in people, and then spreads easily from person to person worldwide. Pandemics are different from seasonal outbreaks or âepidemicsâ of influenza.
In terms of influenza pandemics, experts believe that there have been about 14 since 1500, some of which spread to North America. Since Confederation, five pandemics have affected Canada: the 1890 Russian flu, the 1918 Spanish flu, the 1957 Asian flu, the 1968 Hong Kong flu and the 2009 H1N1 pandemic. 1890: Russian or Asiatic Flu in Canada