Personal Hygiene, Sanitation & Infectious Disease Control
Pathogens and vectors, infectious vs non-infectious diseases, life cycles and control of disease vectors (mosquito, housefly, tsetse fly), water-borne diseases (cholera, typhoid), malaria pathogenesis, and modern sanitation waste management.
In urban centers like Accra and Kumasi, uncollected plastic waste chokes drainage channels (e.g. the Odaw River and Korle Lagoon), precipitating severe flash floods and explosive seasonal outbreaks of cholera and malaria during rainy seasons.
Key Syllabus Learning Objectives
- 1Distinguish between infectious and non-infectious diseases with epidemiological examples
- 2Describe the complete life cycle of the female Anopheles mosquito and outline integrated vector control measures
- 3Explain the transmission, symptoms, prevention, and emergency ORS treatment of cholera
- 4Evaluate modern waste management strategies (the 3Rs, composting, sanitary landfills, biogas digesters) for environmental sustainability
Malaria: Pathogenesis, Vector Biology & Integrated Management
- Plasmodium Life Cycle: Sporozoites injected by female Anopheles migrate to liver cells (schizogony); mature merozoites burst liver cells and infect erythrocytes (red blood cells). Cyclical rupture of RBCs releases toxic hemozoin, triggering the classic fever and shivering paroxysms.
- Vector Adaptations: Anopheles eggs possess lateral air floats; larvae lie horizontally beneath the water surface breathing through a spiracle plate (unlike Culex larvae which hang at an angle via a siphon tube).
- Integrated Vector Management (IVM): Combining Long-Lasting Insecticidal Nets (LLINs), indoor residual spraying, larviciding stagnant drains, and environmental drainage.
The National Malaria Elimination Programme (NMEP) distributes millions of long-lasting insecticide-treated bed nets to pregnant women and children across Ghana.
Disrupting mosquito larval stages in stagnant water eliminates vector populations before adult transmission occurs.
Cholera & Oral Rehydration Therapy (ORT)
- Transmission Pathway: Fecal-oral route via contaminated well water, street food handled with unwashed hands, and open defecation.
- Oral Rehydration Salt (ORS) Formulation: 1 level teaspoon of salt (NaCl, providing electrolytes) + 8 level teaspoons of sugar (glucose, facilitating sodium-glucose co-transport across gut enterocytes) dissolved in 1 liter of boiled, cooled water.
- Sanitation Barriers: Washing hands with soap under running water before eating and after visiting the toilet; chlorinating drinking water; covering food to exclude houseflies.
During cholera outbreaks in coastal slums, community health workers establish emergency ORS stations at local clinics to treat dehydrated patients immediately.
ORS does not cure cholera; it rapidly replaces lost water and vital electrolytes while the immune system and antibiotics clear the infection.
- Clearly distinguish between a vector (living carrier like mosquito) and a pathogen (the actual microscopic organism causing disease like Plasmodium).
- State the exact proportions for preparing emergency home-made ORS: 1 level teaspoon of salt and 8 level teaspoons of sugar in 1 liter of clean water.
- Distinguish between Anopheles and Culex larvae: Anopheles lies parallel/horizontal to the surface of the water; Culex hangs at an angle.
- Stating that mosquitoes cause malaria (mosquitoes transmit the parasite; Plasmodium is the causal agent).
- Boiling ORS solution after dissolving the salts (boil the water FIRST, allow it to cool, then dissolve the sugar and salt).
- Confusing biological control (using living natural predators like Gambusia fish) with chemical control.
- Can I distinguish between infectious and non-infectious diseases with two examples each?
- Can I diagram and describe the four stages of the Anopheles mosquito life cycle?
- Can I state the formula and preparation procedure for home-made Oral Rehydration Solution?
- Can I explain the 3Rs of solid waste management with local examples?
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