CBSE Class 9 Answered
Acute Diseases |
Chronic Diseases |
Acute diseases develop quickly and last for a short period of time. |
Chronic diseases last for a longer period of time, sometimes even for a lifetime. |
Acute diseases do not cause long term adverse effects on our health |
Chronic diseases have drastic long term effects on our health. |
Example: cold, cough, sore throat, influenza |
Example: cardio-vascular diseases, tuberculosis, diabetes |
Infectious Disease |
Non-Infectious Disease |
Caused due to attack of pathogens |
Caused by factors other than pathogens |
Caused due to extrinsic factors |
Caused due to intrinsic factors |
Transmitted from one person to another |
Do not get transmitted from one person to another |
Transmission of diseases occurs through direct contact or some medium (air, water, vectors) |
Transmission in case of hereditary diseases is from parent to offspring |
Community hygiene can reduce the occurrence of these diseases |
Community hygiene is ineffective in reducing the occurrence of these diseases |
E.g. Cholera, Malaria |
E.g. Diabetes, Goitre |