What are the three forms of plague and how are they contracted?

Plague is defined as the transmission of the bacteria infection and have the poor sanitation. There are basically three types of the plague in the body of human that are:

The plague symptoms are developed during the infection in the human body within a week. and they contracted when an infection rodent or bite of the flea take place in the body.  

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: