Norovirus Alert: Staying Well

It hits fast. It feels like the end. Here is what to do.

If you are reading this, you (or your child) likely went from "fine" to "violent illness" in the span of two hours. That is the hallmark of Norovirus (the stomach bug).

In Philadelphia, we see massive surges of this every winter, often sweeping through daycares and households in Fishtown and Northern Liberties like wildfire.³

Symptom Differentiation (2025/2026 Season)

The bad news: it is miserable. The good news: it is almost always short (24 to 48 hours).

Here is your tactical survival guide.

Phase 1: The "Purge" (Hours 0 to 12)

This is the phase of uncontrolled vomiting. Your body is trying to expel the virus.

1. Stop Chugging Water

This is the number one mistake. You feel dehydrated, so you chug a glass of water. The result: Your stomach stretches, triggers the vomit reflex, and you lose more fluid than you drank. The Rule: Nothing by mouth for 1 to 2 hours after the last vomit. Let the stomach settle.

2. The "Sip Strategy" (Micro-Dosing)

Once the vomiting pauses, you must "micro-dose" hydration.

• The Dose: 1 teaspoon (5 mL). No more.
• The Frequency: Every 15 minutes.
• The Fluid: Pedialyte (the popsicles are great), LiquidIV, or LMNT. Water is okay, but it lacks the salt and sugar your gut needs for absorption.
• The Test: If you keep the teaspoon down for an hour, you graduate to a tablespoon.

3. The Zofran (Ondansetron) Hack

This is where Fishtown Medicine changes the game. Nobody wants to be vomiting, so we send in Zofran (Ondansetron). It is a dissolvable tablet that shuts off the nausea signal in the brain.²

• It dissolves under the tongue (so you do not throw it back up).
• It works in about 20 minutes.
• It lets you start drinking fluids effectively, which often prevents an ER trip.

Phase 2: The "Ughhhhhhhh" (Hours 12 to 48)

The vomiting stops, but now you have watery diarrhea, body aches, and a low-grade fever. You feel like you were hit by a SEPTA bus.

• Hydrate Confidently: Now you can drink larger amounts. Aim for 2 to 3 liters of electrolyte solution.
• Eat "White": Rice, toast, bananas, crackers. Avoid dairy, grease, and fiber for 3 days. Your gut lining is stripped, so be gentle. Overconfidence here is the number one reason for going back into the vomiting cycle.

The "Radioactive" Warning

Norovirus is one of the most contagious pathogens on earth.

• Hand Sanitizer Does NOT Work: Alcohol does not kill Norovirus. You must wash with soap and water for 20 seconds.
• Bleach Everything: The virus lives on doorknobs and phones for weeks. Use a bleach-based cleaner (Clorox) on high-touch surfaces.
• Isolate: Do not prepare food for anyone for at least 48 hours after symptoms stop. As few as 15 invisible virus particles can spread the illness.¹

Agency: When to Go to the ER

You are the strategist. You decide when home care has failed.

Go to the Emergency Room if:

• You show signs of severe dehydration: dizziness when standing, confusion, or no urine for 8 or more hours.
• You have severe abdominal pain (particularly lower right side, to rule out appendicitis).
• You see blood in the vomit (bright red or "coffee grounds").

Ride it out (or call us) if:

• You are miserable, but you are making urine and can keep small sips down.

How We Help

We treat this virtually all winter long. The 2025 to 2026 season has hit Philadelphia hard.

1. We Triage: We confirm it is not something deadlier (appendicitis, food poisoning, gallbladder).
2. We Prescribe: We call Zofran into your local pharmacy immediately.
3. We Monitor: We check in by text to make sure you turn the corner.

Scientific References

1. Hall AJ, et al. Norovirus Disease in the United States. Emerg Infect Dis. 2013.
2. Hartling L, et al. Ondansetron for vomiting in children. Cochrane Database Syst Rev. 2011.
3. CDC. Norovirus Surveillance: NoroSTAT Network. 2025/2026 data.