  The strange-quark vector current form factors of the nucleon are analyzed
within the framework of dispersion relations. Particular attention is paid to
contributions made by $K\bar{K}$ intermediate states to the form factor
spectral functions. It is shown that, when the $K\bar{K}\to N\bar{N}$ amplitude
is evaluated in the Born approximation, the $K\bar{K}$ contributions are
identical to those arising from a one-loop calculation and entail a serious
violation of unitarity. The mean square strangeness radius and magnetic moment
are evaluated by imposing unitarity bounds on the kaon-nucleon partial wave
amplitudes. The impact of including the kaon's form factor in the dispersion
integrals is also evaluated.
