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Q1:
What are the various public health measures, which you would suggest as safeguard against infectious diseases?
Solution :
1. Theoretical Framework of Disease Control
Infectious diseases are caused by pathogenic microorganisms (bacteria, viruses, fungi, protozoa) that transmit from an infected host to a susceptible individual [Per Germ Theory of Disease]. Public health measures aim to disrupt the Chain of Infection: Pathogen → Reservoir → Portal of Exit → Mode of Transmission → Portal of Entry → Susceptible Host.
2. Categorization of Public Health Interventions
Interventions are classified based on the stage of transmission they address:
| Strategy Category | Primary Mechanism | Target |
|---|---|---|
| Sanitation & Hygiene | Elimination of environmental reservoirs | Vector-borne & Water-borne pathogens |
| Vector Control | Disruption of biological/mechanical transmission | Malaria, Dengue, Chikungunya |
| Immunization | Enhancement of host immunity | Viral and bacterial pathogens |
3. Sequential Implementation Strategies
Step 1: Maintenance of Personal and Public Hygiene
- Personal Hygiene: Regular handwashing with soap and water to remove pathogens transiently present on the skin.
- Environmental Sanitation: Proper disposal of human and industrial waste. Wastewater treatment plants prevent contamination of water bodies with enteric pathogens (e.g., *Salmonella typhi*, *Vibrio cholerae*).
Step 2: Vector Eradication and Habitat Management
Many diseases like Malaria and Dengue rely on vectors. Safeguards include:
- Source Reduction: Eliminating stagnant water in containers, coolers, and tanks to prevent the oviposition of *Aedes* and *Anopheles* mosquitoes.
- Chemical Control: Introduction of biological agents (e.g., *Gambusia* fish in ponds) or larvicidal sprays to manage insect populations.
Step 3: Immunization and Prophylaxis
Immunization induces Active Immunity by priming the adaptive immune system (B-cells and T-cells) to recognize specific antigens without causing the disease [By Principles of Vaccination]. Vaccines have been instrumental in the eradication of Smallpox and near-elimination of Polio.
Step 4: Surveillance and Quarantine Protocols
Public health authorities must utilize:
- Epidemiological Surveillance: Tracking morbidity and mortality data to detect outbreaks early.
- Isolation and Quarantine: Separating infected individuals to prevent community spread (Portal of Exit management).
4. Summary of Integrated Measures
An effective safeguard system is defined as:
$\text{Public Health Safety} = \sum (\text{Hygiene} + \text{Vector Control} + \text{Immunization} + \text{Surveillance})$
Final Solution: Public health safeguards against infectious diseases include the maintenance of personal and environmental hygiene, rigorous control of disease vectors through habitat management, the implementation of widespread immunization programs to build herd immunity, and active surveillance combined with isolation protocols to minimize pathogen transmission.
More Questions from Class 12 Biology Human Health and Disease EXERCISES
- Q1: What are the various public health measures, which you would suggest as safeguard against infectious diseases?
- Q2: In which way has the study of biology helped us to control infectious diseases?
- Q2: In which way has the study of biology helped us to control infectious diseases?
- Q3(a): How does the transmission of each of the following diseases take place? (a) Amoebiasis
- Q3(a): How does the transmission of each of the following diseases take place? (a) Amoebiasis
- Q3(b): How does the transmission of each of the following diseases take place? (b) Malaria
- Q3(b): How does the transmission of each of the following diseases take place? (b) Malaria
- Q3(c): How does the transmission of each of the following diseases take place? (c) Ascariasis
- Q3(c): How does the transmission of each of the following diseases take place? (c) Ascariasis
- Q3(d): How does the transmission of each of the following diseases take place? (d) Pneumonia
- Q3(d): How does the transmission of each of the following diseases take place? (d) Pneumonia
- Q4: What measure would you take to prevent water-borne diseases?
- Q4: What measure would you take to prevent water-borne diseases?
- Q5: Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.
- Q5: Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.
- Q6: Name the primary and secondary lymphoid organs.
- Q6: Name the primary and secondary lymphoid organs.
- Q7(a): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (a) MALT
- Q7(a): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (a) MALT
- Q7(b): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (b) CMI
- Q7(b): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (b) CMI
- Q7(c): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (c) AIDS
- Q7(c): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (c) AIDS
- Q7(d): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (d) NACO
- Q7(d): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (d) NACO
- Q7(e): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (e) HIV
- Q7(e): The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form: (e) HIV
- Q8(a): Differentiate the following and give examples of each: (a) Innate and acquired immunity
- Q8(a): Differentiate the following and give examples of each: (a) Innate and acquired immunity
- Q8(b): Differentiate the following and give examples of each: (b) Active and passive immunity
- Q8(b): Differentiate the following and give examples of each: (b) Active and passive immunity
- Q9: Draw a well-labelled diagram of an antibody molecule.
- Q9: Draw a well-labelled diagram of an antibody molecule.
- Q10: What are the various routes by which transmission of human immuno-deficiency virus takes place?
- Q10: What are the various routes by which transmission of human immuno-deficiency virus takes place?
- Q11: What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
- Q11: What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
- Q12: How is a cancerous cell different from a normal cell?
- Q12: How is a cancerous cell different from a normal cell?
- Q13: Explain what is meant by metastasis.
- Q13: Explain what is meant by metastasis.
- Q14: List the harmful effects caused by alcohol/drug abuse.
- Q14: List the harmful effects caused by alcohol/drug abuse.
- Q15: Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?
- Q15: Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?
- Q16: Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
- Q16: Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
- Q17: In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
- Q17: In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
CBSE Solutions for Class 12 Biology Human Health and Disease
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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