SPADA

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Two distinct groups within Type A
Vectors Hosts
f d h d • Type A.I. oun in eastern Nort America an west coast
• Type . found in western North America
• These distributions are correlated with the distributions of
specific mammal hosts and tick/fly vectors
From Farlow et al. 2005
Three major subgroups in A.I
Lower virulence
in mice
Tree from Birdsell et al. 2014
Mouse data from Molins et al. 2010
Higher virulence
in mice