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Cross sections of laboratory CNO and rp astrophysical reactions are enhanceddue to the presence of the multi-electron cloud that surrounds the targetnuclei. As a result the relevant astrophysical factors are overestimated unlesscorrected appropriately. This study gives both an estimate of the errorcommitted if screening effects are not taken into account and a rough profileof the laboratory energy thresholds at which the screening effect appears. Theresults indicate that, for most practical purposes, screening corrections topast relevant experiments can be disregarded. Regarding future experiments,however, screening corrections to the CNO reactions will certainly be ofimportance as they are closely related to the solar neutrino fluxes and the rpprocess. Moreover, according to the present results, screening effects willhave to be taken into account particularly by the current and future LUNAexperiments, where screened astrophysical factors will be enhanced to asignificant degree.Comment: 6 RevTex pages + 2 ps figures. (Revised version). Accepted for  publication in Journal of Physics

Screening enhancement factors for laboratory CNO and rp astrophysical reactions