Lesson Notes By Weeks and Term v4 - JHS 2
HUMAN HEALTH
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HUMAN HEALTH
Download the Lessonotes Mobile Ghana app for faster lesson access on Android and iPhone.
Subject: Science
Class: JHS 2
Term: 3rd Term
Week: 8
Grade code: B8.5.2.2.1
Strand code: 5
Sub-strand code: 2
Content standard code: B8.5.2.2
Indicator code: B8.5.2.2.1
Theme: HUMANS AND THE ENVIRONMENT
Subtheme: HUMAN HEALTH
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Bacterial diseases are common causes of illness in Ghana, especially where there are challenges with sanitation, safe water, food handling, and access to health services. Learners may hear about *food poisoning* after eating contaminated food, *meningitis* outbreaks in parts of Ghana (especially the northern belt during the dry season), and *gonorrhoea* as a sexually transmitted infection (STI). Understanding the nature of bacterial diseases helps learners protect themselves, support their families, and make responsible health decisions.
A. What are bacteria? Bacteria are microscopic living organisms (single-celled) found almost everywhere: soil, water, air, on our skin, and inside our intestines. Many bacteria are harmless or useful (e.g., bacteria in the gut help digestion; bacteria used in making yoghurt). Some bacteria are pathogenic (disease-causing).
Key idea: A bacterial disease happens when harmful bacteria enter the body, multiply, and damage tissues or produce toxins.
B. The nature of bacterial diseases (what makes them “bacterial”?) To explain the *nature* of bacterial diseases, learners should understand these features: 1) They are caused by living organisms that multiply Once bacteria enter the body (through mouth, nose, cuts, or sexual contact), they can multiply quickly if conditions are favourable. This can overwhelm the body’s defences and cause illness. 2) Many bacterial diseases involve toxins and inflammation Some bacteria produce toxins (poisons) that cause symptoms such as vomiting and diarrhoea (common in food poisoning). The body responds with inflammation (swelling, pain, fever) as it fights the infection. 3) They can spread in specific ways (transmission routes) Common routes include: Contaminated food and water (e.g., food poisoning, cholera, typhoid) Droplets from coughing/sneezing (e.g., meningitis can spread through close contact) Direct contact with body fluids/sexual contact (e.g., gonorrhoea) Through cuts/wounds (e.g., tetanus from contaminated wounds) 4) Many bacterial diseases can be treated with antibiotics (but not all cases) Antibiotics kill bacteria or stop them from multiplying. Misuse of antibiotics (wrong dose, stopping early, using without prescription) can lead to antibiotic resistance—bacteria become harder to kill.
> Important: Antibiotics do not treat viral diseases like common cold or measles.