The incubation period for Ebola can be up to how many days?

The incubation period for Ebola can be up to how many days?

• A. 21 days.
• B. 14 days
• C. 7 days
• D. 28 days

Answer: (A)

The main concept is the incubation period—the time from exposure to the first appearance of symptoms. For Ebola, almost all people who will develop symptoms do so within 21 days after exposure, which is why 21 days is the standard window used for monitoring and quarantine after potential exposure. This 21-day limit comes from outbreak data showing that the vast majority of cases become symptomatic by day 21, with much smaller chances of onset after that. The other durations don’t align with this evidence: 14 days is too short for Ebola, 7 days is far too short, and 28 days exceeds the observed maximum. In practice, a 21-day observation period is used to determine if someone exposed to Ebola remains symptom-free and not infectious.

The main concept is the incubation period—the time from exposure to the first appearance of symptoms. For Ebola, almost all people who will develop symptoms do so within 21 days after exposure, which is why 21 days is the standard window used for monitoring and quarantine after potential exposure. This 21-day limit comes from outbreak data showing that the vast majority of cases become symptomatic by day 21, with much smaller chances of onset after that.

The other durations don’t align with this evidence: 14 days is too short for Ebola, 7 days is far too short, and 28 days exceeds the observed maximum. In practice, a 21-day observation period is used to determine if someone exposed to Ebola remains symptom-free and not infectious.