This means our ability to prevent new infections depends on two things: reducing the rate at which people contact each other – or reducing the probability of infection given contact.
Other non-pharmaceutical interventions, like facemasks and hand-hygiene, reduce the effective contact, or the chance the virus is transmitted if there is contact.
The rate of new infections over a given time period is called the “force of infection,” which depends on a few things: the rate at which people contact each other; the probability of infection given contact; and the number of infectious individuals in a population.
The infection risk is especially high among household contacts.
Although following these guidelines should help, it’s frustrating there hasn’t been more clear, concise communication about the risk of infection.