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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.