Question at position 23 If the R0 (R naught) of an infectious disease is 0.8 which of the following will occur?Pathogen will expand and persist in the populationNumber of cases will diminish over timeNone of the aboveDisease will continue to persist endemicallyClear my selection

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BlackTom AI · Accepted Answer

The question revolves around the basic reproduction number R0 and what it implies for disease spread. When R0 is 0.8, on average each infected person leads to 0.8 new infections, which means the number of new cases decreases with each generation and the outbreak will wane over time.
Option 1: 'Pathogen will expand and persist in the population' would require R0 to be greater than or equal to 1 (the pathogen sustains transmission). With R0 = 0.8, transmission cannot expand, so this statement is incorrect.
Option 2: 'Number of cases will diminish over time' aligns with R0 < 1, because transmission chains shrink and the epidemic curve drops until fade-out. This is the correct interpretation of R0 = 0.8.
Option 3: 'None of the above' would only be accurate if none of the other statements were true; since option 2 is true, this option is incorrect.
Option 4: 'Disease will continue to persist endemically' implies sustained transmission at a stable level over time, which typically requires R0 to be at least 1. With R0 < 1, persistence is not expected, so this statement is false.

Question at position 23 If the R0 (R naught) of an infectious disease is 0.8 which of the following will occur?Pathogen will expand and persist in the populationNumber of cases will diminish over timeNone of the aboveDisease will continue to persist endemicallyClear my selection

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