Question at position 34 If the R0 (R naught) of an infectious disease is 1.2 which of the following will occur?Number of cases will diminish over timePathogen will expand and persist in the populationNone of the aboveDisease will continue to persist endemicallyClear my selection

Question

BlackTom AI · Accepted Answer

Understanding R0 helps interpret what happens with an infectious disease. The basic reproduction number, R0, represents the average number of secondary cases produced by a single infected individual in a wholly susceptible population.
Option 1: 'Number of cases will diminish over time.' When R0 is greater than 1, each case generates more than one new case on average, leading to growth in cases, not a decline. So this statement is incorrect.
Option 2: 'Pathogen will expand and persist in the population.' With R0 = 1.2 (>1), the infection is expected to spread and increase in the short term, and unless strong control measures or immunity reduce transmission, it can persist in the population over time. This matches the standard interpretation of R0 > 1, making this the correct choice.
Option 3: 'None of the above.' Since there is a correct statement among the options (Option 2), saying none applies would be false.
Option 4: 'Disease will continue to persist endemically.' While R0 > 1 supports potential persistence, the wording implies a guaranteed endemic state regardless of interventions, herd immunity development, or time. This is a stronger claim than what R0 alone establishes, so it is not as precise as Option 2 and can be considered incorrect in this context.
In summary, the key idea is that an R0 above 1 indicates expansion and potential persistence, rather than a decline, which aligns with Option 2 being the correct statement.

Question at position 34 If the R0 (R naught) of an infectious disease is 1.2 which of the following will occur?Number of cases will diminish over timePathogen will expand and persist in the populationNone of the aboveDisease will continue to persist endemicallyClear my selection单项选择题

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