You are absolutely right Vicky.
We have so many diseases in the world now spread by people travelling to a large variety of places and carrying the disease producing organisms with them.
Is it important to wash your hands. Hand washing is the single most effective way to prevent the spread of infections. You can spread certain "germs" (a general term for microbes like viruses and bacteria) casually by touching another person ,public computers, pianos, subway poles, countertops and many more...