Final answer:
The term 'Recurrent' best describes signs and symptoms that come and go, while 'Endemic' refers to a disease that is always present in a population. Acute disease periods of illness and decline differ by the quantity of pathogens present.
Step-by-step explanation:
The term that best describes "signs and symptoms that come and go" is d) Recurrent. This refers to conditions or diseases that present with multiple episodes of symptoms, often with periods of remission in between. In contrast, chronic refers to a condition that persists over a long time, acute describes conditions that are severe but short-lived, and progressive refers to conditions that worsen over time.
A disease that is constantly present in a population is called c) Endemic. The stage of disease during which the patient begins to present general signs and symptoms is usually referred to as the prodromal period.
An acute disease has two periods that are notable: the period of illness and the period of decline. Both periods are similar in that the patient is experiencing significant symptoms, but they differ in the quantity of pathogen present. The period of illness typically has a high level of pathogens causing symptoms, while the period of decline sees a reduction of pathogens as the immune response becomes effective or medical treatment takes effect, leading to a reduction in symptoms.