Hi Karthikrad,
Welcome to the Mattress Forum! 
Bed bugs are found worldwide, and they tend to be “hitchhikers”. If you’re looking to get rid of bed bugs, your first step would be to hire a qualified exterminator and have them come and treat your home (heat treatment is quite popular and successful). Then you would want to encase your mattress. A true encasement for bedbugs prevents bed bugs from getting into or out of the mattress once the encasement is on the mattress. There is more about mattress encasements in post #2 here and in post #2 here that you may find useful.
Phoenix