Disinfecting After Parvo?
You want to disinfectant your yard ASAP, It survives extremely low and high temperatures. The only household disinfectant that kills the virus is bleach.[The dilute bleach solution needs to be a (1:10 ratio) to disinfect and kill parvovirus.
Female Cat Urinating on My Desk?
Did the Vet say if it behavior related or even stress? You may need to place her on Fluoxetine (kitty prozac). You could also try buying another liter box. Have you changed her cat liter? They also Feliaway which is a plug-in diffuser used for calming.