Pre-symptomatic transmission of influenza can occur during which time window before symptom onset?

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Study for the UF CPP Infectious Diseases Test. Use flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Pre-symptomatic transmission of influenza can occur during which time window before symptom onset?

Explanation:
Pre-symptomatic transmission occurs when someone is contagious before they feel sick. For influenza, viral shedding starts about one day before symptoms appear and remains present for several days after onset, with the highest risk around the time symptoms begin. That makes the window of one to two days before symptom onset the best answer. Spreading three to four days before onset is farther back than the usual contagious period, transmission at the exact moment symptoms start is not pre-symptomatic, and saying not before ignores documented transmission before symptoms.

Pre-symptomatic transmission occurs when someone is contagious before they feel sick. For influenza, viral shedding starts about one day before symptoms appear and remains present for several days after onset, with the highest risk around the time symptoms begin. That makes the window of one to two days before symptom onset the best answer. Spreading three to four days before onset is farther back than the usual contagious period, transmission at the exact moment symptoms start is not pre-symptomatic, and saying not before ignores documented transmission before symptoms.

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