text: Due to concerns about B.1.617, many countries have imposed travel restrictions on India in case passengers may carry the strain?
classes:  No, travel restrictions are one of the most effective measures to help prevent the spread of B.1.617.  Also, travel restrictions are one of the most effective measures to help prevent the spread of B.1.617.  Yes, travel restrictions are one of the most effective measures to help prevent the spread of B.1.617.