Question about the highlighted part of the following passage

Question

Event and interval from vaccination

A. Anaphylaxis anaphylactic shock (7 days )

B. Brachial neuritis ( 28 days )

C. Any acute complications or sequelae (including death) of above events (interval - not applicable)

D. Events described in manufacturer's package insert as contraindications to additional doses of vaccine (interval - see package insert)

When it says interval not applicable. What do they mean by saying interval? It should mean stop or pause. But what does it mean in this context? I know that it is very hard to grasp, so I'm asking here.

Answer 1

The clue is in the title

Event and interval from vaccination

An interval of time is a period of time

the two examples A and B show number of days as the interval

The interval is the time from when the vaccination was given to when the symptom may show up.

A. Anaphylaxis anaphylactic shock (7 days)

Anaphylactic shock may show up within 7 days, after which the probability of occurrence diminishes.

C. Any acute complications or sequelae (including death) of above events (interval - not applicable)

interval - not applicable means complications could show up at any time

This use of interval should not be confused with the BrE meaning of interval which is an intermission (AmE) between parts of a performance.