  For a hypergraph $H$, the transversal is a subset of vertices whose
intersection with every edge is nonempty. The cardinality of a minimum
transversal is the transversal number of $H$, denoted by $\tau(H)$. The Tuza
constant $c_k$ is defined as $\sup{\tau(H)/ (m+n)}$, where $H$ ranges over all
$k$-uniform hypergraphs, with $m$ and $n$ being the number of edges and
vertices, respectively. We give an upper bound and a lower bound on $c_k$. The
upper bound improves the known ones for $k\geq 7$, and the lower bound improves
the known ones for $k\in\{7, 8, 10, 11, 13, 14, 17\}$.
