Communicable diseases
Explanation
Diseases are broadly classified based on their transmissibility into two main categories: Communicable (Infectious) and Non-communicable (Non-infectious). This classification depends on whether the disease can be spread from one individual to another through various agents or vectors.
Option-wise Analysis
- Congenital diseases is incorrect: Congenital diseases are present from birth. They arise due to genetic abnormalities or developmental defects during pregnancy (e.g., Down syndrome, Hemophilia). They are not transmitted through external vectors or environmental media.
- Communicable diseases is correct: Communicable diseases are infectious diseases caused by pathogens such as bacteria, viruses, fungi, or protozoa. These diseases are transmissible from an infected person to a healthy person through direct contact, air, water, food, or vectors (e.g., mosquitoes). Examples include Tuberculosis, Malaria, and Cholera.
- Degenerative diseases is incorrect: Degenerative diseases involve the gradual deterioration of the structure or function of tissues and organs, often associated with aging (e.g., Arthritis, Alzheimer's disease). These are non-communicable.
- Deficiency diseases is incorrect: Deficiency diseases occur due to the lack of essential nutrients, vitamins, or minerals in the diet over a prolonged period (e.g., Scurvy, Rickets, Goitre). These are restricted to the individual and cannot be transmitted to others.
Key Takeaway
Communicable diseases are defined by their ability to spread via pathogens through vectors, air, or water, whereas non-communicable diseases (congenital, degenerative, deficiency, allergies) are non-infectious and do not spread between individuals.