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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
By definition, when a medication is administered intravenously, its bioavailability is 100%.
IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
Vaccines prevent between 2.5 and 4 million deaths every year.
Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.