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.
1 Redeeming an I or EE bond before it is 5 years old will result in the loss of the last 3 months of accrued interest. 2  I and EE bonds earn interest for 30 years if you don't redeem them. 3  All bonds are guaranteed at least their face value by 20 years.