Every number above is a link. Hover or tap it to see the data behind it.
What's likely to come home
Ranked by how much of each virus is around, which way it's moving, and how often it's the one sending school-age kids home. Most come from Bay Area wastewater; colds and croup viruses come from lab tests, because wastewater can't see them.
Symptom decoder
Tap what your kid has. We'll match it against what's circulating right now. It's a hint, not a diagnosis.
Pick a symptom or two.
Trends in the wastewater
Each line compares a virus with what's typical for that treatment plant over the past year. Everyone flushes, so it catches mild and silent infections that never get tested.
Beyond the wastewater
What doctors, labs and hospitals are seeing. These come from CDC and are statewide or regional, so they move slower and cover more ground than the wastewater. When they agree with it, believe it a little more.
On the radar
Rare things wastewater can catch early. A detection means the virus was in the sewage, which can be one traveler. It is not a case count.
Air quality
Coming up
Field guide
What each virus is, how long it lasts, what helps, and when to call the doctor. General guidance from CDC, CDPH and AAP sources. Not medical advice.
Where the numbers come from
Every feed, what it covers, and how fresh it is. If one goes quiet, the rest keep working and this table says so.
Tip jar
Sniffcast is free and has no ads. If it saved you a sick day or a 2 a.m. spiral, a tip keeps the forecast running.