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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.