  We present a relativistic and unitary approach to pion- and photon-nucleon
scattering taking into account the $\pi N$, $\rho N$, $\omega N$, $\eta N$,
$\pi\Delta$, $K \Lambda$ and $K \Sigma$ channels. Our scheme dynamically
generates the s- and d-wave nucleon resonances N(1535), N(1650), N(1520) and
N(1700) and isobar resonances $\Delta(1620)$ and $\Delta(1700)$ in terms of
quasi-local two-body interaction terms. We obtain a fair description of the
experimental data relevant for slow vector-meson propagation in nuclear matter.
The s-wave $\rho $- and $\omega $-meson nucleon scattering amplitudes, which
define the leading density modification of the $\rho$- and $\omega $-meson
spectral functions in nuclear matter, are predicted.
