  The main object of this paper is to find necessary and sufficient conditions
for generalized Bessel functions of first kind $zu_{p}(z)$ to be in the classes
$\mathcal{SP}_{p}(\alpha ,\beta )$ and $\mathcal{UCSP}(\alpha ,\beta )$ of
uniformly spirallike functions and also give necessary and sufficient
conditions for $z(2-u_{p}(z))$ to be in the above classes. Furthermore, we give
necessary and sufficient conditions for $\mathcal{I}(\kappa ,c)f$ \ to be in
$\mathcal{UCSPT}(\alpha ,\beta )$ provided that the function $f$ is in the
class $\mathcal{R}^{\tau }(A,B)$. Finally, we give conditions for the integral
operator $\mathcal{G(}\kappa ,c,z\mathcal{)=}% \int_{0}^{z}(2-u_{p}(t))dt$ to
be in the class $\mathcal{UCSPT}(\alpha ,\beta ).$ Several corollaries and
consequences of the main results are also considered.
