Title: Default for The implications of periods

Q: Which of the following would make it easier for cases of disease to be isolated, and for an outbreak to be brought under control?
- If the incubation period is longer than the latent period (For effective isolation, one would want to identify cases before they became infectious. When might this be possible? You may find 1.9 The logic behind isolation: incubation, latent and infectious periods useful.)
- If the latent period is longer than the incubation period (If the latent period is longer than the incubation period, cases will develop symptoms before they become infectious to others. If individuals are promptly isolated when they develop symptoms, it may be possible to reduce the number of people they are able to infect)
- If both periods are the same (For effective isolation, one would want to identify cases before they became infectious. If cases became infectious at the onset of symptoms, it may be difficult to isolate the infected individuals as they will already be infectious to others by the time they are isolated. You may find 1.9 The logic behind isolation: incubation, latent and infectious periods useful.)
- The relative lengths would have no influence on isolation/control (The relative lengths do matter, but which way round would help, and which way round would hinder control efforts? You may find 1.9 The logic behind isolation: incubation, latent and infectious periods useful.)
A: If the latent period is longer than the incubation period

Q: Kaci Hickox arrived back in the US on 24th October 2014. Her last contact with a known Ebola patient was on October 20th. If Kaci had become infected while in Sierra Leone, in which theoretical scenario could she have transmitted Ebola to others in the US?
- Only within the first 2 days after returning to the US
- 10 days after returning to the US, even while feeling totally well
- 27 days after returning to the US if she had been totally well except during the last two days
- 15 days after returning to the US when she had been feeling unwell for two days
A: 15 days after returning to the US when she had been feeling unwell for two days