Which stage of infection is characterized by mild and non-specific symptoms?

What is the final stage of infection, where the body recovers and returns to its normal state?

During which stage of infection can a person transmit the disease to others, even without symptoms?

Which stage of infection is affected by factors such as the route of entry of the pathogen, the immune response of the host, how fast or slow the pathogen multiplies?

In which stage of infection do symptoms become most severe and specific to the illness?