Measuring indicators of impact in contact tracing

The time between infection of generation 0 and onset of symptoms in generation 0.

The time between infection of generation 0 and onset of symptoms in generation 1.

The time between the infection of generation 0 and infection of generation 1.

The number of people that every case will infect, given that everyone they have contact with is susceptible.

The number of people that a case will infect, on average, in a particular context and given that everyone they have contact with is susceptible.

The number of people that a case will infect, on average, in every context.

The basic reproductive number can be easily estimated, but the reproductive number cannot.

The basic reproductive number assumes no interventions are in place to slow transmission where the reproductive number does not.

The basic reproductive number can vary drastically over time and place where the reproductive number does not.

The average number of days between sample collection and return of test results

The proportion of all infections identified

The proportion of all contacts quarantined

The average number of days between symptom onset in the case and quarantine of their contacts

The proportion of all infections identified

The average number of days between sample collection and return of test results

The proportion of all contacts quarantined

The average number of days between symptom onset in the case and quarantine of their contacts

It provides a measure of program’s impact on transmission and the trajectory of the outbreak.

It takes into account the cost-effectiveness of use of the program’s resources.

It is the only possible way to evaluate the impact of a contact tracing program.

Cases are often most infectious on or around the time they develop symptoms. Therefore, the time period between symptom onset of the case, as a proxy for peak infectiousness of the case, and when you can identify and quarantine their contacts should be minimized as much as possible to stop transmission.

Infected contacts often become infectious at the same time as the cases who infected them. Therefore, the time period between symptom onset of the case, as a proxy for peak infectiousness of the case and their contacts, and when you can identify and quarantine their contacts should be minimized as much as possible to stop transmission.

Each case will infect exactly one more person.

The number of new cases is expected to keep going down.

The number of new cases is expected to keep increasing, but not as quickly as if the reproductive number were 2 or 3.

The number of new cases is expected to stay constant over time.

The proportion of people with COVID-19 disease who die (# with COVID-19 who die/# with COVID-19)

The proportion of all people infected with SARS-CoV-2 who die (# infected who die/# all people infected)

The proportion of people who develop COVID-19 among those who are infected with SARS-CoV-2 (# with COVID-19/# with SARS-CoV-2 infection)

Measuring indicators of impact in contact tracing

Measuring indicators of impact in contact tracing >> Measuring and Maximizing Impact of COVID-19 Contact Tracing

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Measuring indicators of impact in contact tracing >> Measuring and Maximizing Impact of COVID-19 Contact Tracing

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