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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.