In which of the following patterns of disease does the patient experience no signs or symptoms?

A) decline

B) prodromal

C) convalescence

D) incubation

E) incubation and convalescence

The correct answer is option E) "incubation and convalescence".

Explanation:

The incubation period of an infectious disease is defined as the lapse between when a person is infected and the first symptoms are onset. While the convalescence stage is defined as the gradual recovery that a person experience once she or he overcomes the infectious disease. In both, the first and the last stage of the infectious disease (incubation and convalescence, respectively) the patient does not experience signs or symptoms of the disease.