Hereditary diseases:
- A disease that a child inherits from his parents.
- Hemophilia is a disease in which blood does not clot and the affected person may bleed to death even a small cut.
- Hemophilia is a heredity disease carried by females and expressed by males.
- When a color blind male marries with a normal woman not carrying the gene for color blindness, their off springs will be normal sons and carriers daughter.
Contagious diseases:
- A type of infectious disease which spreads from one person to another by physical contact.
Water borne disease:
- Diseases like cholera, typhoid, dysentery, hook-worm and diarrhea.
- The most important therapy for cholera is water and electrolytes replacement.
Air borne disease:
- Airborne diseases are bacteria or viruses that are most commonly transmitted through small respiratory droplets.
- Diseases such as tuberculosis, influenza, chickenpox, and small pox.
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