A few years ago, the avian influenza virus (H5N1) swept from Asia, across Russia, to Europe. Nigeria was the first African country to report detection of the virus in chickens. The phylogeny below depicts the relationships between H5N1 from Nigeria and samples from other parts of Asia and Europe. Samples from Nigeria are labeled either as Lagos or northern Nigeria. Given the phylogeny below, what is the minimum number of times H5N1 was introduced to Nigeria? 
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