Handshake is often seen as a sign of gesture and greeting to other people. It is more commonly seen in the corporate world where businessmen shake hands with other business people.
It is generally taught that handshake can cause spread of disease. Contact with others after touching dirty surfaces can spread germs through a handshake. Children are taught in school to regularly wash their hands to protect themselves from sickness caused by exposure to pathogenic microorganisms. Using soap and water is universally recognized as the best method to reduce the presence of bacteria that gather in our hands as we interact with other people. However, using only soap and water will not sterilize your hands. Using alcohol gel is the most common way to achieve hand sterility.
For your own safety and protection, always wash your hands when dealing with food. Food preparation requires cleanliness of the person who will prepare and cook. After cleaning the kitchen, it is also best to wash your hands to remove all the dirt.
It is also a regular practice to wash your hands after using the comfort rooms. In public comfort rooms, there are wash area available to help prevent the spread of germs. Some public comfort rooms even offer sanitizers for their patrons.
You may also need to carry a small handy bottle of sanitizer so that wherever you may go, you can always use it. If you are unsure of the hands you are about to handshake with, it is best to bring sanitizer on hand for your own health protection.