Health and disease (part – 2)

  1. Acquired Diseases

These occur only after birth and are non-inheritable. These are of two types:

i)Communicable or infectious diseases.

These can be transmitted from an infected person to a healthy person by Means of air, water, food, physical contact. These are caused by infection & Multiplication of some kind of organism.

Classification of causative agent they are of six types.-

1)Bacterial diseases.-Diptheria, Whooping cough, Leprosy, Syphilis, tetnus,

Typhoid, plague, pneumonia, cholera, anthrax etc. –Viral diseases Dengue, Influenza, polio, smallpox, common cold, AIDS rabies, Infections hepatitis etc.

3)Protozoan: malaria, amoebiasis  ,kala azar, sleeping sickness etc.

4)Helminthic diseases: Elephantiasis, ascariasis, liver rot, trichinosis etc.

5)Fungal diseases: ring worm, candidiasis etc.

6)Rickettsial diseases.-Typhus fever, Trench fever, Q-fever, Rocky mountain Spotted fever.

b)On the basis of this their mode of transmission, communicable diseases are of two types,

1)Contagious diseases: These communicable diseases can spread from an Infected person to healthy person by actual contact between them e,g, STDs, Leprosy, small pox, chicken pox etc.

2)Non-contagious diseases

These can be spread from an infected to healthy person with food, air or water e.g. teniasis, ascariasis, cholera, tuberculosis  typhoid etc.

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