  We study linked loops of string in the presence of bosonic condensates and
fermionic zero modes on the strings. We find that the strings necessarily carry
a current if the bosons have an Aharanov-Bohm interaction with the string. The
fermionic case is analyzed in the context of the standard model where there are
lepton and quark zero modes on $Z-$strings. Here we find that the fermionic
ground state in the linked string background is lower than the ground state
when the loops are unlinked but otherwise identical. As in the bosonic case,
the $Z-$strings carry a non-vanishing electric current in the ground state. The
baryon number of the linked configuration is found to agree with previous
indirect results. We also evaluate the angular momentum, electromagnetic charge
and baryonic three current on the linked $Z-$string configuration. Finally we
point out a possible gravitational analogue of the linked string system.
