Office of NIH History

	Audio Transcript Dr. Harvey Klein
	Do not forget, we had not seen a new virus in the blood supply in thirty years, and retroviruses did not cause human disease, we thought, with the possible exception of T-cell leukemia. So these were all disturbingly new concepts. A disease with an incubation period of ten years, or seven years at the time, whatever was believed. A retrovirus. A disease that was transmitted by blood, but was not seen in these other situations.
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