Can saliva from oral sex cause a yeast infection and irritation?

Vaginal yeast infections are not caught from other persons or from outside the body. Yeasts are normal in the vagina; when they overgrow and cause symptoms, or when the immune system reacts to them, symptoms begin. A new yeast infection does not mean you caught yeast from anywhere; it has been in you for years. Treatment is easy and effective; it's usually an uncomfortable but minor problem.