State any two conditions essential for good health.
Two conditions essential for good health are:
(i) Good physical health: All body systems (digestive, respiratory, circulatory, etc.) functioning properly, proper nutrition, regular exercise, absence of disease or disability.
(ii) Good mental and social well-being: Freedom from mental stress, positive social relationships, emotional balance, and a supportive environment. The WHO definition states that health is “a state of complete physical, mental and social well-being and not merely the absence of disease.”
Additional conditions include: clean environment with safe drinking water, sanitation, and balanced diet.
State any two conditions essential for being free of disease.
Two conditions essential for being free of disease are:
(i) Personal hygiene: Keeping the body clean (bathing regularly, washing hands before eating, after using the toilet) prevents microorganisms from entering the body and causing disease.
(ii) Safe food and water: Consuming clean, properly cooked food and safe (boiled/filtered/treated) drinking water prevents entry of pathogens through the digestive route. This also includes proper sanitation and waste disposal.
Other conditions: timely immunisation (vaccination), avoiding contact with infected individuals, and vector control.
Are the answers to the above questions necessarily the same or different? Explain.
The answers are different, because good health and freedom from disease are related but not identical concepts.
Being free of disease is a narrow condition — it simply means no pathogen or disease-causing factor is present in the body. It focuses on the absence of illness.
Good health is a broader concept that encompasses physical, mental, and social well-being. A person can be free of infectious diseases but still not have good health if they suffer from malnutrition, chronic stress, social isolation, or poor mental health.
For example: someone free of all infections but experiencing severe depression or living in poverty with inadequate food does not have good health. Thus, the conditions for good health include — but go beyond — the conditions for freedom from disease.
List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
Three symptoms that indicate sickness and need for a doctor:
(i) High fever (temperature above 38.5°C) — indicates the body is fighting an infection.
(ii) Persistent headache with nausea and vomiting — could indicate a serious condition (meningitis, severe infection, etc.).
(iii) Loose motions (diarrhoea) with dehydration — indicates gastrointestinal infection.
If only one symptom were present: It would depend on the severity. A mild headache alone may not warrant a doctor visit and could be managed with rest. However, if the single symptom is severe, persistent, or unusual (e.g., very high fever, blood in stools), one should definitely see a doctor. A single symptom can sometimes be the first sign of a serious underlying condition, so when in doubt, it is always better to consult a doctor.
In which of the following cases do you think the long-term effects on your health are likely to be most unpleasant? (a) if you get jaundice (b) if you get lice (c) if you get acne.
(a) Jaundice is likely to have the most unpleasant long-term effects on health.
Jaundice is caused by Hepatitis B or C virus (or other forms) and affects the liver. If not treated properly, it can lead to chronic liver disease, liver cirrhosis, and even liver failure or liver cancer. The long-term damage to this vital organ makes jaundice the most serious.
(b) Lice — an ectoparasite infestation that causes itching and discomfort but no significant long-term health damage. It can be treated easily.
(c) Acne — a skin condition that may cause psychological distress and some scarring but is generally not life-threatening and does not damage vital organs.
Why are we normally advised to take bland and nourishing food when we are sick?
We are advised to take bland and nourishing food when sick for the following reasons:
(i) Bland food is easy to digest: When sick, the body's digestive system may be weakened. Bland food (khichdi, rice, toast) does not overwork the digestive system, reduces nausea and vomiting, and allows the body to focus energy on healing.
(ii) Nourishing food provides energy for recovery: The immune system requires extra energy, vitamins (especially C and A), proteins, and minerals to produce antibodies, white blood cells, and repair damaged tissues. A nourishing diet ensures these requirements are met.
(iii) Spicy or heavy food can worsen symptoms: Such food can irritate the stomach and intestines, cause indigestion, and divert the body's resources away from fighting the infection.
What are the different means by which infectious diseases are spread?
Infectious diseases spread through the following means:
(i) Air (droplet transmission): Pathogens spread through tiny droplets released when an infected person sneezes, coughs, or talks. Examples: tuberculosis (TB), common cold, influenza, COVID-19, measles.
(ii) Water and food (faecal-oral route): Contaminated water or food carries pathogens. Examples: cholera, typhoid, hepatitis A, food poisoning (Salmonella).
(iii) Sexual contact: Sexually transmitted infections (STIs/STDs). Examples: HIV/AIDS, syphilis, gonorrhoea.
(iv) Blood: Direct contact with infected blood (blood transfusion, shared needles). Examples: HIV, hepatitis B and C.
(v) Vectors (animal carriers): Insects and animals that carry and transmit pathogens. Examples: Mosquitoes spread malaria (Plasmodium), dengue, chikungunya; houseflies spread typhoid.
(vi) Direct contact: Touching infected skin or surfaces. Examples: fungal infections (ringworm), chickenpox (skin lesions).
What precautions can you take in your school to reduce the incidence of infectious diseases?
Precautions to reduce infectious diseases in school:
(i) Clean drinking water: Provide filtered/boiled/RO-purified drinking water to prevent waterborne diseases.
(ii) Proper sanitation: Maintain clean toilets with regular disinfection; proper drainage and waste disposal.
(iii) Respiratory hygiene: Educate students to cover their mouth and nose with a tissue or elbow when coughing or sneezing; provide masks during outbreaks.
(iv) Handwashing: Ensure students wash hands with soap before eating, after using the toilet, and after outdoor activities.
(v) Good ventilation: Well-ventilated classrooms reduce concentration of airborne pathogens.
(vi) Isolation of sick students: Students showing symptoms of infectious disease should stay home or be sent to the school sick room.
(vii) Vaccination campaigns: Regular immunisation drives in school (polio, measles, etc.).
(viii) Hygienic canteen: Clean, properly cooked food served in the school canteen; no stale or uncovered food.
What is immunisation?
Immunisation (vaccination) is the process of artificially providing a person with immunity against a specific infectious disease by introducing antigens (dead, weakened, or inactivated pathogens or their toxins/proteins) into the body, usually by injection or oral administration.
The process:
(i) The introduced antigens are recognised as “foreign” by the immune system.
(ii) The immune system produces specific antibodies and develops memory cells against that pathogen.
(iii) When the actual pathogen enters the body in the future, the immune system recognises it quickly (due to memory cells) and destroys it before the disease can develop.
Examples: vaccines for polio (OPV), tetanus, measles-mumps-rubella (MMR), hepatitis B, COVID-19, BCG (tuberculosis).
What are the immunisation programmes available at the nearest health centre in your locality?
In India, immunisation is provided through the Universal Immunization Programme (UIP) at government health centres. Common vaccines available include:
(i) BCG — against Tuberculosis (TB). Given at birth.
(ii) OPV (Oral Polio Vaccine) — against Poliomyelitis. Multiple doses from birth.
(iii) DPT / Pentavalent — against Diphtheria, Pertussis (Whooping cough), Tetanus (+ Hepatitis B + Hib).
(iv) MMR — against Measles, Mumps, Rubella.
(v) Hepatitis B — against Hepatitis B viral infection.
(vi) Typhoid vaccine — against typhoid fever.
(vii) Rotavirus vaccine — against severe diarrhoea in infants.
(viii) Japanese Encephalitis vaccine — in endemic areas of India.
(ix) COVID-19 vaccines (Covaxin, Covishield, etc.) — for eligible age groups.
What is the difference between infectious and non-infectious diseases?
Infectious Diseases:
• Caused by pathogens (bacteria, viruses, fungi, protozoa, worms).
• Can spread from one person to another (contagious) through air, water, contact, vectors, etc.
• Can be treated with specific medicines: antibiotics (bacteria), antivirals (viruses), antifungals (fungi).
• Can often be prevented by vaccination.
• Examples: tuberculosis, cholera, malaria, dengue, COVID-19, typhoid.
Non-Infectious Diseases:
• Not caused by pathogens; caused by genetic factors, lifestyle, nutritional deficiency, environmental factors, or physiological malfunction.
• Cannot spread from person to person (not contagious).
• No specific antibiotic/antiviral treatment; managed through lifestyle changes, medicines for symptoms, surgery, etc.
• Examples: diabetes, heart disease, cancer, arthritis, hypertension, kwashiorkor (nutritional deficiency).
Classify the following as acute or chronic diseases: Common cold, Tuberculosis, Chickenpox, Cancer, Diabetes.
Acute diseases (short-term, rapid onset, resolve quickly):
• Common cold — lasts a few days (4–7 days).
• Chickenpox — typically lasts 1–2 weeks.
Chronic diseases (long-term, persist for months or years, or lifelong):
• Tuberculosis (TB) — can last months to years if untreated; treatment takes 6 months or more.
• Cancer — a long-term disease that persists for months to years.
• Diabetes — a lifelong (chronic) metabolic disorder.
What is the principle of treatment of infectious diseases?
There are two main principles of treatment of infectious diseases:
(i) Symptomatic treatment (reducing symptoms): Medicines that reduce the effects of the disease without killing the pathogen. For example, antipyretics to reduce fever, analgesics (painkillers) to reduce pain, antihistamines to reduce inflammation. This provides relief to the patient and makes them comfortable while the body fights the infection.
(ii) Causal treatment (killing the pathogen): Using specific drugs that target and kill or inhibit the growth of the pathogen causing the disease. Examples:
• Antibiotics (penicillin, amoxicillin) — for bacterial infections (TB, typhoid).
• Antivirals (oseltamivir, acyclovir) — for viral infections (influenza, herpes).
• Antifungals (fluconazole) — for fungal infections.
• Antiprotozoal drugs (chloroquine) — for protozoal infections (malaria).
Causal treatment is more effective as it addresses the root cause of the disease. Both approaches are often used together.
What is the principle of prevention of infectious diseases?
Prevention is better than cure. The principles of prevention of infectious diseases are:
(i) General (public health) prevention: Measures that reduce exposure to pathogens for the entire population:
• Providing clean drinking water and proper sewage disposal.
• Vector control (anti-mosquito measures — nets, sprays, removing stagnant water).
• Good personal hygiene (handwashing, sanitation).
• Proper food safety and hygiene.
(ii) Specific prevention (immunisation): Vaccination provides the body with specific immunity against particular pathogens, so even if the pathogen enters, the body is prepared to fight it quickly. This is the most effective specific prevention measure.
(iii) Reducing transmission: Quarantine/isolation of infected individuals, wearing masks during outbreaks, practising safe sex, not sharing needles, and proper disposal of infected materials.
Prevention strategies are more cost-effective than treatment and protect communities rather than just individuals.
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