Patient Care Technician — Lesson 2
Lesson 2 covers core public health principles and interventions, specifically focusing on vaccines, physical activity guidelines, and chronic disease prevention as documented by the CDC. Vaccines work by training the immune system to recognize and combat specific pathogens using weakened or inactivated antigens that trigger an immune response without causing disease. The CDC-recommended childhood immunization schedule protects children from 16 vaccine-preventable diseases before age 2, and vaccines are recommended at every stage of life. Physical activity guidelines state that adults need at least 150 minutes of moderate-intensity aerobic activity and 2 days of muscle-strengthening activity each week. Furthermore, chronic disease prevention involves managing key risk factors such as high blood pressure, high blood cholesterol, tobacco use, excess body weight, and alcohol consumption.