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This is not an exogenous infection; therefore, no person-to-person spread of the pathogen occurs.
Exogenous infections can be caused by organisms that colonize the skin such as Staphylococcus aureus or Streptococcus spp.
"The retroviruses we see in humans in 1988 probably got into the germ line tens of millions of years ago as a result of exogenous infection - maybe in an epidemic similar to the AIDS one we're experiencing now," says Martin.