Sagot :
The sentence that shows the central idea of the given excerpt is "Elizabethans do not understand infection and contagion as we do."
According to the given excerpt, the narrator describes the Elizabethans as having a totally different understanding of infection when compared to most other people.
He notes that their understanding of infections is as a result of Galen's teachings who said that health is dependent on four humors: phlegm, yellow bile or choler, black bile and blood.
Therefore, the central idea or claim of the excerpt is that Elizabethans have a different understanding to infections than we do.
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