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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.