How are the normal functions of the host affected by the pro-virus?

The presence of a provirus, which is a virus integrated into the host's genome, can disrupt normal cellular functions by altering gene expression and interfering with regulatory pathways. This can lead to changes in cell growth, differentiation, and apoptosis, potentially resulting in oncogenesis or other diseases. Additionally, the immune response may be compromised as the host cells may express viral proteins that evade detection. Overall, the integration of a provirus can significantly impact the host's health and physiological balance.