Theories of Disease Transmission

Theories of disease transmission explain how diseases spread from one person or organism to another. Key theories include: 1. **Contagion Theory**: Suggests diseases are caused by contact with infected individuals or their materials. 2. **Germ Theory**: Proposes that microscopic pathogens, like bacteria and viruses, are the primary cause of diseases. 3. **Vector Theory**: Highlights that some diseases are transmitted through vectors, such as insects (like mosquitoes) that carry pathogens from one host to another. 4. **Environmental Theory**: Focuses on how environmental factors, like sanitation and pollution, contribute to the spread of diseases. These theories help in understanding prevention and control measures.