  Charge and isospin event-by-event fluctuations in high-energy pp-collisions
are predicted within the Unitary Eikonal Model, in particular the fluctuation
patterns of the ratios of charged-to-charged and neutral-to-charged pions.
These fluctuations are found to be sensitive to the presence of unstable
resonances, such as $\rho $ and $\omega $ mesons. We predict that the
charge-fluctuation observable $D_{UEM}$ should be restricted to the interval
$8/3\le D_{UEM}\le 4$ depending on the $\rho /\pi $ production ratio. Also, the
isospin fluctuations of the DCC-type of the ratio of neutral-to-charged pions
are suppressed if pions are produced together with $\rho $ mesons.
