Waltz of the Universe by Starr Kemmer

Waltz of the Universe is the story of the crew of the starcruiser Galius and first-time captain Talana Moriahr. Their journey leads them to one planet that is self destructing and another one that is under attack. In the midst of it all romance blossoms for several crew members. On top of all the problems, a madness is slowly taking over the Galius and they soon realize that it has also invaded the planet that they just visited. They find themselves in a race to discover a cure before the insanity claims every life on both their ship and the planet.