Hosts: Vincent Racaniello, Dickson Despommier, Alan Dove, and Rich Condit

Vincent, Dickson, Alan and Rich discuss an estimate of the number of different mammalian viruses on Earth.

Links for this episode:

• Estimate of unknown viral diversity in mammals (mBio)
• How many viruses on Earth? (virology blog)
• Letters read on TWiV 249

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