Differentiating between primary and secondary cases within contact exposure

[sadiekelly]

https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(13)70304-9/fulltext

This paper describes the bias when calculating key epidemiological indicators such as CFR from primary vs secondary cases. It would be good to indicate, or be able to indicate from data collected, primary and secondary cases.

Location of contacts (albeit to admin level 3) could enable clusters to be identified. Date of contact and date of symptom onset could identify primary case within a cluster.