You fail to mention that the CDC under Democrats enabled syphillis experimentation upon black men. So it's the Dem's and the trusty CDC that caused the current hesitation. Why should they again trust another Democrat run CDC, they screwed up before, no second chances here.
The CDC, our trusty first-rate health institution, under the very Democratic Pres. Johnson decided to continue to subject blacks to syphillis experiments:
'In 1947 the Nuremberg code was written, and in 1964 the World Health Organization published their Declaration of Helsinki. Both aimed to protect humans from experimentation, but despite this, the Centers for Disease Control (which had taken over from the USPHS in controlling the study) actively decided to continue the study as late as 1969.'