How to calculate the number of days Lacey was quarantined?

The isolation time is determined according to the infectivity of infectious diseases.

The isolation time is counted from the first day of onset, or 1 and 14, which is the last day of isolation period.

For example, COVID-19 is contagious within 14 days, so it needs to be quarantined for 14 days. Another example is that H 1N 1 is contagious within 7 days, so it needs to be isolated for 7 days. Chickenpox 14 days, mumps for 5 days, and so on, all have different isolation times.