diseases

People fetching contaminated water. Image credit mg.co.za ZIMSEC O Level Combined Science Notes: Diseases: Cholera

• I usually spread by contaminated food and/or water
• The cholera pathogen is a bacterium called Vibrio cholerae
• It is an infectious disease
• The pathogen lives and multiplies in the digestive […]
  

Sindiso Marume holding her brother’s health card. Image credit irinnews.org ZIMSEC O Level Combined Science Notes: Disease:Immunity and Immunisation

• Immunity-is the ability of the body to resist diseases
• There are various types of immunity:

• Antigen-is any substance that causes […]
  

Parirenyatwa entrance. Image credit financialgazette.co.zw ZIMSEC O Level Combined Science Notes: Introduction to diseases

• A disease is an illness
• Diseases are caused by pathogens
• Pathogens come in the form of:
• bacteria, viruses, fungi, protozoa(single celled animals) and small worms
• Bacteria can be viewed using a light microscope

[…]