The answer to 'how to prevent bed bug' is to take proactive measures to identify and eliminate bed bugs before they become a serious infestation. This includes regularly inspecting your home, especially bedrooms, for signs of bed bugs, using mattress and box spring encasements, and taking steps to reduce clutter where bed bugs can hide.
It's also important to be vigilant when traveling, as bed bugs can easily hitchhike in luggage and clothing. Inspect hotel rooms, avoid placing luggage on beds, and wash and dry all clothing on high heat upon returning home. If you suspect a bed bug problem, it's best to contact a professional pest control technician who can properly identify the issue and recommend the most effective treatment options.