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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.

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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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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.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Illicit drug use costs the United States approximately $181 billion every year.

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