CB5

• A pathogen is a microorganism that causes a communicable disease.
• Health is the state of physical and mental wellbeing, not just the absence of disease or infirmity.
• Disease is a condition that is caused by a pathogen and results in a loss of health.
• A non-communicable disease is a disease that cannot be passed from one person to another.
• A communicable disease is a disease that can be passed from one person to another.
• Communicable diseases can be passed through direct contact, airborne, or waterborne.
• BMI can be calculated by dividing weight in kilograms by height in metres squared.
• Obesity is defined as having a BMI over 30.
• Lymphocytes are white blood cells that produce antibodies and help fight infection
• Pathogens have antigens which are proteins on their surface.
• Lymphocytes have antibodies which are proteins that bind to antigens.
• Vectors are organisms that carry a pathogen from one host to another.