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Health is a state of physical, mental and social
well being.
The conditions necessary for good health are :i) Good physical and social environment.
ii) Good economic conditions.
iii) Social equality and harmony.
Good physical and social environment includes
clean surroundings, good sanitation, proper
garbage disposal and clean drinking water .
Good economic conditions includes job
opportunities for all for earning to have
nutritious food and to lead a healthy life.
Healthy

Disease free

1.

It is a state of physical, mental
and social well being.

It is a state of absence from
diseases.

2.

It refers to the individual,
physical and social
environment.

It refers only to the individual.

3.

The individual has good health.

The individual may have good health
or poor health.
When a person is affected by a
disease either the normal
functioning or the appearance of one
or more systems of the body
changes for the worse.
These changes give rise to signs of
the disease called symptoms.
On the basis of the symptoms the
physicians look for the signs of a
particular disease and conduct tests
Diseases are of different types. They
are :i) Acute diseases :- are diseases which
last only for a short period of time and
does not have long term effect on health.
Eg:- cold, cough, typhoid, cholera
etc.
ii) Chronic disease :- are diseases which
lasts for a long time and has long term
drastic effect on health.
Eg :- diabetes, tuberculosis,
elephantiasis, arthritis, cancer etc.
iii) Infectious diseases (Communicable
diseases) :- are diseases which spread
from an infected person to a healthy
person through air, water, food, vectors,
physical contact or sexual contact. Eg :common cold, chicken pox, mumps,
measles, typhoid, cholera, tuberculosis,
malaria, AIDS etc.
iv) Non-infectious diseases (Noncommunicable diseases) :- are diseases
which are not spread from an infected
person to a healthy person. Eg :- beri
beri, rickets, scurvy, night blindness,
diabetes, cancer, high blood pressure etc.
Diseases are caused by :i) Pathogens like virus, bacteria, fungi, protozoans
or
worms.
ii) Poor health and under nourishment.
iii) Malfunctioning of body parts.
iv) Environmental pollution.
v) Genetic disorders.
a) Infectious agents :-The
agents which cause infectious
diseases are called pathogens.
These are Viruses, Bacteria,
Fungi, Protozoan and worms.

Sl.
No.

Infectious
agents

Diseases

1.

Viruses

Common cold, Influenza,
Measles, Mumps, Chicken pox,
AIDS, Hepatits-B etc.

2.

Bacteria

Cholera, Typhoid,
Tuberculosis, Tetanus,
Anthrax, Food poisoning etc.

3.

Fungi

Skin infections.

4.

Protozoan

Malaria, Kala-azar, Amoebic
dysentery, Sleeping sickness.

5.

Worms

Intestinal infections,
b) Means of spread of infectious diseases :Infectious diseases spread from an infected person to a healthy person through
air, water, food, vectors, physical contact and sexual contact.
i) Through air :- Common cod, Tuberculosis, Pneumonia
etc.
ii) Through water :- Cholera, Amoebic dysentery etc.
iii) Through vectors :Mosquitoes :- Malaria, Dengue, Yellow fever etc.
Flies
:- Typhoid, Tuberculosis, Diarrhea, Dysentery
etc.
iv) Through sexual contact :- Syphilis, AIDS.
AIDS virus can also spread though blood transfusion and from the mother to
her child during pregnancy and through breast feeding.
c) Organ-specific and tissue-specific
manifestations :Disease causing microbes enter the body by different
means and goes to different organs and tissues.
i) Microbes which enters through the nose are
likely to go to the lungs. ( Bacteria which cause tuberculosis of
lungs).
ii) Microbes which enter through the mouth are
likely to stay in the gut ( Bacteria which causes Typhoid) or liver
(Bacteria which causes Jaundice).
iii) Virus which causes AIDS enter the body
through sexual organs during sexual contact and spreads through the
lymph to all parts of the body and damages the immune system.
iv) Virus which causes Japanese encephalitis (brain
fever) enters the body through mosquito bite and goes and infects
the brain.
d) Principles of treatment :The treatment of infectious diseases consists of two steps. They are to reduce the
effects of the disease (symptoms) and to kill the microbes which caused the
disease.
i) To reduce the effects of the disease :This can be done by taking medicines to bring down the effects of the disease
like fever, pain or loose motions etc. and by taking bed rest to conserve our energy.
ii) To kill the microbes :This can be done by taking suitable antibiotics and drugs which kills the
microbes and the disease is cured.
e) Principles of prevention :There are two ways of prevention of infectious diseases. They are general
ways and specific ways.

i) General ways of prevention :Public hygiene is most important for prevention of infectious diseases. Proper and
sufficient food for every one will make people healthy to resist infection.
Air borne diseases can be prevented by living in conditions that are not crowded. Water
borne diseases can be prevented by providing safe drinking water. Vector borne diseases
can be prevented by providing clean environment.

ii) Specific ways of prevention :The specific ways to prevent infectious disease is immunization by taking vaccines.
Vaccines provide immunity from infectious diseases like tetanus, diphtheria, whooping
cough, measles, polio etc.
Our body has an immune system which fights microbial infection. When this system first
sees an infectious microbe, it kills the microbe and remembers it. So if the microbe enters
the body the next time, it responds more vigorously. Vaccines mimic the infectious microbe
and strengthens our immune system and protects the body from infectious diseases.

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Why do we fall ill

  • 1.
  • 2. Health is a state of physical, mental and social well being. The conditions necessary for good health are :i) Good physical and social environment. ii) Good economic conditions. iii) Social equality and harmony. Good physical and social environment includes clean surroundings, good sanitation, proper garbage disposal and clean drinking water . Good economic conditions includes job opportunities for all for earning to have nutritious food and to lead a healthy life.
  • 3.
  • 4. Healthy Disease free 1. It is a state of physical, mental and social well being. It is a state of absence from diseases. 2. It refers to the individual, physical and social environment. It refers only to the individual. 3. The individual has good health. The individual may have good health or poor health.
  • 5.
  • 6. When a person is affected by a disease either the normal functioning or the appearance of one or more systems of the body changes for the worse. These changes give rise to signs of the disease called symptoms. On the basis of the symptoms the physicians look for the signs of a particular disease and conduct tests
  • 7.
  • 8. Diseases are of different types. They are :i) Acute diseases :- are diseases which last only for a short period of time and does not have long term effect on health. Eg:- cold, cough, typhoid, cholera etc. ii) Chronic disease :- are diseases which lasts for a long time and has long term drastic effect on health. Eg :- diabetes, tuberculosis, elephantiasis, arthritis, cancer etc.
  • 9. iii) Infectious diseases (Communicable diseases) :- are diseases which spread from an infected person to a healthy person through air, water, food, vectors, physical contact or sexual contact. Eg :common cold, chicken pox, mumps, measles, typhoid, cholera, tuberculosis, malaria, AIDS etc. iv) Non-infectious diseases (Noncommunicable diseases) :- are diseases which are not spread from an infected person to a healthy person. Eg :- beri beri, rickets, scurvy, night blindness, diabetes, cancer, high blood pressure etc.
  • 10.
  • 11. Diseases are caused by :i) Pathogens like virus, bacteria, fungi, protozoans or worms. ii) Poor health and under nourishment. iii) Malfunctioning of body parts. iv) Environmental pollution. v) Genetic disorders.
  • 12.
  • 13. a) Infectious agents :-The agents which cause infectious diseases are called pathogens. These are Viruses, Bacteria, Fungi, Protozoan and worms. Sl. No. Infectious agents Diseases 1. Viruses Common cold, Influenza, Measles, Mumps, Chicken pox, AIDS, Hepatits-B etc. 2. Bacteria Cholera, Typhoid, Tuberculosis, Tetanus, Anthrax, Food poisoning etc. 3. Fungi Skin infections. 4. Protozoan Malaria, Kala-azar, Amoebic dysentery, Sleeping sickness. 5. Worms Intestinal infections,
  • 14. b) Means of spread of infectious diseases :Infectious diseases spread from an infected person to a healthy person through air, water, food, vectors, physical contact and sexual contact. i) Through air :- Common cod, Tuberculosis, Pneumonia etc. ii) Through water :- Cholera, Amoebic dysentery etc. iii) Through vectors :Mosquitoes :- Malaria, Dengue, Yellow fever etc. Flies :- Typhoid, Tuberculosis, Diarrhea, Dysentery etc. iv) Through sexual contact :- Syphilis, AIDS. AIDS virus can also spread though blood transfusion and from the mother to her child during pregnancy and through breast feeding.
  • 15. c) Organ-specific and tissue-specific manifestations :Disease causing microbes enter the body by different means and goes to different organs and tissues. i) Microbes which enters through the nose are likely to go to the lungs. ( Bacteria which cause tuberculosis of lungs). ii) Microbes which enter through the mouth are likely to stay in the gut ( Bacteria which causes Typhoid) or liver (Bacteria which causes Jaundice). iii) Virus which causes AIDS enter the body through sexual organs during sexual contact and spreads through the lymph to all parts of the body and damages the immune system. iv) Virus which causes Japanese encephalitis (brain fever) enters the body through mosquito bite and goes and infects the brain.
  • 16. d) Principles of treatment :The treatment of infectious diseases consists of two steps. They are to reduce the effects of the disease (symptoms) and to kill the microbes which caused the disease. i) To reduce the effects of the disease :This can be done by taking medicines to bring down the effects of the disease like fever, pain or loose motions etc. and by taking bed rest to conserve our energy. ii) To kill the microbes :This can be done by taking suitable antibiotics and drugs which kills the microbes and the disease is cured.
  • 17. e) Principles of prevention :There are two ways of prevention of infectious diseases. They are general ways and specific ways. i) General ways of prevention :Public hygiene is most important for prevention of infectious diseases. Proper and sufficient food for every one will make people healthy to resist infection. Air borne diseases can be prevented by living in conditions that are not crowded. Water borne diseases can be prevented by providing safe drinking water. Vector borne diseases can be prevented by providing clean environment. ii) Specific ways of prevention :The specific ways to prevent infectious disease is immunization by taking vaccines. Vaccines provide immunity from infectious diseases like tetanus, diphtheria, whooping cough, measles, polio etc. Our body has an immune system which fights microbial infection. When this system first sees an infectious microbe, it kills the microbe and remembers it. So if the microbe enters the body the next time, it responds more vigorously. Vaccines mimic the infectious microbe and strengthens our immune system and protects the body from infectious diseases.