The epidemiological triad or epidemiological triangle is a traditional model to explain how infectious diseases are caused and transmitted. All of the following are parts of the epidemiological triangle, except:

Correct option is C

Ans: (c) Remedy Sol. The epidemiological triangle consists of three key components that explain how infectious diseases are caused and transmitted:
1. External Agent: This is the pathogen (e.g., bacteria, virus, fungi) that causes the disease.
2. Susceptible Host: This is the individual who is vulnerable to the disease due to factors like age, immunity, and genetics.
3. Environment: This includes external factors that affect the spread of disease, such as climate, sanitation, and population density.
The remedy is not part of the epidemiological triangle. While remedies (such as vaccines, medications, and treatments) are used to combat infectious diseases, they do not form part of the traditional model that explains the spread of disease.
Explanation of each option:
· (a) External Agent: Correct. The external agent is one of the key components of the epidemiological triangle. It refers to the infectious agent (e.g., virus or bacteria).
· (b) Susceptible host: Correct. The susceptible host is another essential part of the epidemiological triangle. It refers to the individual or population at risk of contracting the disease.
· (c) Remedy: Correct answer. Remedy is not part of the epidemiological triangle. The model focuses on the agent, host, and environment, not on how to treat or prevent the disease.
· (d) Environment: Correct. The environment plays a vital role in the spread of infectious diseases, such as factors like temperature, sanitation, and living conditions.