  A search for single-top production, $ep \rightarrow etX$, has been performed
with the ZEUS detector at HERA using data corresponding to an integrated
luminosity of $0.37\fbi$. No evidence for top production was found, consistent
with the expectation from the Standard Model. Limits were computed for
single-top production via flavour changing neutral current transitions. The
result was combined with a previous ZEUS result yielding a total luminosity of
0.50fb-1. A 95% credibility level upper limit of 0.13 pb was obtained for the
cross section at the centre-of-mass energy of $\sqrt{s}=315\gev$.
