February 2025

Introduction to diseases

By |2025-02-12T09:25:32+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Parirenyatwa entrance. Image credit financialgazette.co.zw 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

    • […]

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Diseases: Cholera

By |2025-02-12T09:26:00+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

People fetching contaminated water. Image credit mg.co.za 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 […]
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Immunity and Immunisation

By |2025-02-12T09:28:55+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Sindiso Marume holding her brother's health card. Image credit irinnews.org 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 […]
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Diseases:HIV/AIDS

By |2025-02-12T09:30:54+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

Zimbabwe nurse and health worker. Image credit icrc.org Zimbabwe nurse and health worker. Image credit icrc.org ZIMSEC O Level Combined Science Notes: Disease:Immunity and Immunisation

HIV and Its effects

  • HIV stands for Human Immunodeficiency Virus
  • It lives in the body fluids including blood, saliva, semen, tears etc
  • It enters the body in […]
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