Feline Lower Urinary Tract Disease (FLUTD) or Feline Urologic Syndrome (FUS) are both used synonymously as umbrella terms covering a variety of urinary conditions. These conditions include bladder inflammation (cystitis) with or without a bacterial infection, and with or without crystals (struvite being the type that form in alkaline pH).
A broad category of viruses, including the herpes and calici virus, fall under the umbrella term of feline upper respiratory tract disease commonly known as the "cat flu". Vaccines neither prevent nor help URIs. Ditto antibiotics, which are not needed in the absence of a secondary bacterial infection.