there are several elements
to successful prevention. These include disclosure
to partners, avoidance of sex
during outbreaks, condoms, and chronic suppressive therapy with antiviral medications. Each component has been studied individually and found to significantly reduce the risk of transmission. By doing all of them, the risk becomes very low but not zero (how low cannot be said).
2. Condoms which do no cover the lesions will not prevent transmission.
3. Chronic suppressive therapy.