Infection & ResponseDeep Dive
Disease Transmission in Detail
Part of Pathogens and Disease Transmission — GCSE Biology
This deep dive covers Disease Transmission in Detail within Pathogens and Disease Transmission for GCSE Biology. Types of pathogens, how diseases spread, transmission methods, and prevention strategies It is section 5 of 18 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 5 of 18
Practice
18 questions
Recall
20 flashcards
Disease Transmission in Detail
1. Direct Contact Transmission
- Mechanism: Pathogens pass directly from infected to healthy person through physical contact
- Examples: Skin infections, sexually transmitted diseases (STDs), some viral infections
- Prevention: Avoid contact with infected individuals, use protective barriers
2. Airborne Transmission
- Mechanism: Pathogens travel in droplets through the air when infected people cough, sneeze, or talk
- Range: Droplets can travel 1-2 meters and remain airborne briefly
- Examples: Tuberculosis, influenza, measles, COVID-19
- Prevention: Masks, good ventilation, isolation, covering coughs
3. Vector Transmission
- Mechanism: Animals (vectors) carry pathogens from infected to healthy hosts
- Vector examples: Mosquitoes (malaria), ticks (Lyme disease), rats (plague)
- Malaria cycle:
- Mosquito bites infected person, takes up Plasmodium protists in blood
- Protists reproduce and develop inside mosquito
- Mosquito bites healthy person
- Protists are injected into new host's bloodstream
- Prevention: Control vector populations, protective clothing, mosquito nets
4. Water and Food Transmission
- Mechanism: Pathogens contaminate water supplies or food
- Examples: Cholera (water), Salmonella (food), E. coli (contaminated vegetables)
- Prevention: Clean water supplies, proper food preparation and storage, good sanitation