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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.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.
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.
![A tracheotomy tube in place, inserted through an opening in the front of the neck and anchored withi](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_8496830.jpeg)
![During their elderly years, men and women continue to exhibit aspects of the gender roles that they ...](https://biology-forums.com/gallery/27/medium_660366_16_04_17_12_25_17_278561009.png)