What is a communicable disease?
a disease that cannot be passed from person to person
a disease that is caused by lifestyle factors
a disease that can be passed from person to person

A communicable disease is a disease that can be passed from person to person. It can also occur from an animal to a person or vice versa. Airborne viruses, bacteria, blood, and bodily fluids can cause the spread of these diseases. When things are infectious or contagious it also refers to communicable diseases. The most common communicable disease is the flu, which can easily spread in an enclosed environment with a recycled circulating air (e.g. air-conditioning). Infectious disease caused by blood contact like HIV/AIDs are also dominant in society.   

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Habit 1: be proactive  habit 2: begin with the end in mind  habit 3: put first things first  habit 4: think win-win  habit 5: seek first to understand, then to be understood  habit 6: synergize  habit 7: sharpen the saw