Sneezing is often very common. Kitties who've had a recent FVRCP vaccination tend to sneeze some for several days after. Dust etc. can also cause them to sneeze, as it does us. As long as Mina's eating fine, and has no signs of yellow/greenish nasal discharge, I wouldn't worry any. If it progresses to a colored discharge, then it's a bacterial infection, and antibiotics are needed. Putting a kitty on antibiotics frequently can lead to an immunity to the antibiotic should they REALLY need it.