  In a recent publication, we used the data from WMAP and SDSS to constrain the
primordial perturbations and to predict the B-mode polarization sourced by
cosmic string networks. We have been alerted by A. Slosar to the existence of
errors in the code we used to calculate the Cosmic Microwave Background
anisotropies from cosmic strings. Correcting the errors leads to a significant
increase in the vector mode contribution to the CMB temperature and
polarization anisotropies as well as an overall renormalization of the various
string spectra. In these notes we explain the nature of the errors and discuss
their implications for previously published constraints on cosmic strings based
on this code. The chief change in our results is that our derived limit for the
cosmic string tension is strengthened: G\mu < 1.8 (2.7) * 10^{-7} at 68 (95)%
confidence. We also note that the newly-enhanced vector mode contribution
produces a greatly-increased amplitude for B-mode polarization in the CMB which
could exceed the B-mode power produced by the lensing of primordial E-mode
polarization into B-mode polarization.
