The following are chronic infections, except:

What phase follows shortly after the incubation period, exhibiting early and mild symptoms of a disease such as general aches?

A young boy observed muscle stiffness or mild spasms on August 16. He was brought to the hospital on August 17 for a stiff jaw, trouble breathing, and a high temperature. The doctor diagnosed tetanus based on a physical exam, as he reportedly injured himself with a rusty nail on August 3. Metronidazole was given to the boy every six to eight hours for 7 days, and after keeping him for 3 more days, he was discharged on August 28. Identify the prodromal period for tetanus. 

John was hospitalized with dehydration, nausea, vomiting, and diarrhea, along with a temperature of 39.8 degrees Celsius. The doctor isolated Salmonella enterica and Plesiomonas shigelloides from the patient and found out that he had eaten turkey together with a cocktail drink at a restaurant the day before. Identify the primary etiologic agent in this case.

What distinguishes chronic infectious diseases from acute infectious diseases in terms of disease progression?

In the study of infectious diseases, which term best describes the phenomenon where a bacterium remains inactive within a host for a period before becoming active and causing symptoms?