How long am i contagious before symptoms start during a respiratory infection?

[FrankLL]

I’m trying to understand the timeline for when someone with a respiratory infection is actually contagious. My doctor mentioned I was likely shedding virus for a day before my sore throat even started, which seems so counterintuitive. It makes me wonder how many people are spreading things unknowingly during that pre-symptomatic phase.

[Steven.W]

That matches what my doctor told me too, that I was probably shedding virus a day before the sore throat showed up. It felt odd to hear, but later I realized you can be contagious before you feel bad. Every infection seems to do its own thing, though.

[MichaelL]

I spent a couple of sick days at work last year before I even felt sick. I wore a mask after the runny nose started, but I still worried I spread it to coworkers who had no symptoms. It made me rethink how careful people are when they feel perfectly fine.

[Nathan_A]

I tried to track the timing by watching who got sick around me, but the pattern never lined up neatly. Sometimes people got sick after I felt fine, sometimes before, and it was hard to pin anything down.

[StellaET]

Maybe the bigger issue isn’t a neat window of contagion but how unpredictable symptoms are and how quietly some people spread things. Pre-symptomatic or not, small interactions like sharing a cup or riding an elevator can matter. Do you think a lot of spread happens before anyone notices a thing?