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.
All I bonds earn interest for 30 years from the issue date. For EE bonds, find the issue date printed on the paper I bonds, or use the calculator tool at TreasuryDirect, to find the final maturity date. Look up the final maturity of electronic bonds in your TreasuryDirect account.