I’m not an expert on this so could someone explain how if secondary attack is defined like this google search gave me form another paper:

>” Secondary attack rate (SAR) is the probability that an infection occurs among susceptible persons within a reasonable incubation period after known contact with an infectious person in household or other close-contact environments.”

Explain how the nne calc doesn’t need to account for the number of people in the situation. Is there other better or more clear definitions? Or Should the base rate be adjusted to account for number of people?

My other question is, is the NNE about unique excluded people or is it just unique excluded visits. I.e a single person is excluded from eating at a restaurant at lunch and then again at dinner, does that count for 2 of the 1000?