Making the world better, one answer at a time. a superbug is a micro-organism that is resistant to most anti-biotics. the superbugs in recent history are imune to all anti-biotics,except one.
Both electronic and paper versions of Series I savings bonds are purchased at face value and earn interest until they are redeemed or reach maturity. You must hold Series I bonds for at least 12 months before redeeming them. Series I savings bonds will continue to earn interest for up to 30 years. They will cease paying interest once they have matured.
EE Bonds earn interest for up to 30 years. To find out whether your bond is earning interest and what it is worth: see the Savings Bond Calculator. The Savings Bond Calculator also shows. 1  when interest will next be added to the dollar value of an EE Bond that is still earning interest (under Next Accrual).