Question

how would a person develop those diseases that don't spread by contact with a sick person??

Answer 1

The diseases which do not spread by physical contact can be spread in the following ways :

1)Through air [ cold ,cough ]

2)By vectors [ malaria - female anopheles mosquito ]

3)Blood transfusion [ eg : - AIDS ]

4)Through infected needles [ eg : - AIDS ]

Answer 2

A person will develop those diseases that don't spread by contact with a sick person by sharing the same objects of use, by wind, etc

Disease

Any slight change in the normal activities of life process is called a disease. Depending on their communicability diseases are classified as infectious and non-infectious diseases.

Communicable disease

• Communicable diseases are also called infectious diseases. It is usually caused by pathogens. The pathogens might be bacteria, viruses, fungus, mycoplasma, etc.
• They are called communicable diseases because they can spread from one person to the other by means of contact. here the contact might not be direct in-person to person.
• It might also spread through wind, contaminated water, sharing used things by a diseased person, touching the same objects used by an infected person, etc.

Hence, if a person develops a disease that doesn't spread by direct contact with person, can also spread through wind, contaminated water, etc