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During Theodore Roosevelt's first three years as president,
Vasodilation
The widening of blood vessels, which decreases blood pressure and allows increased blood flow.
Active Natural Immunity
Immunity that develops after exposure to a disease-causing organism, leading to the production of antibodies and immunological memory.
Developing Disease
The process by which a disease begins to form or increase in severity, involving the progression from initial symptoms to more severe conditions.
Vaccinated
Being vaccinated refers to having received a vaccine, which is a substance that stimulates the body's immune response against diseases.
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