Abstract
In the first 3 months of 1989, seven U.S. senators, in two groups, spent the night out in the Amazon jungle swinging in hammocks. One of the group, a certain distinguished senator from Pennsylvania slept very well indeed, judging from the noises he emitted during the night. The next morning, he explained to some of his compan ions, who did not sleep so well as a result, that he was not snoring but was communicating with the howler monkeys. Were he writing this chapter I am sure he would assert that he hadl been studying yellow fever in the sylvan cycle.

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