It’s possible to catch a stomach bug twice in 2 weeks because it spreads easily and there are different strains to which you might be exposed.

A stomach bug typically refers to viral gastroenteritis, an infection that affects the stomach and intestines, often caused by viruses like norovirus, rotavirus, and adenovirus.

While an initial infection often provides some immunity, it’s possible to catch a stomach virus in back-to-back weeks, usually due to a different strain.

Here, we explain why reinfection is possible, the chances of catching a stomach bug twice in 2 weeks, and ways to prevent future episodes.

Yes, it’s possible to catch a stomach bug, like norovirus, twice in 2 weeks due to the virus’s resilience and how easily it spreads.

Norovirus, a common cause of gastroenteritis, is highly contagious and can lead to repeat infections.

According to the Centers for Disease Control and Prevention (CDC), norovirus can survive on surfaces for days or weeks. Reinfection is possible if surfaces aren’t thoroughly disinfected, hands aren’t washed frequently, or hygiene is not maintained in shared spaces.

Another reason you could catch a stomach bug twice in 2 weeks is the virus’s shedding period. People who have had norovirus may continue to shed the virus for up to 2 weeks after symptoms disappear.

This extended shedding period increases the risk of spreading the virus, even after the initial illness has cleared. Exposure to norovirus during this time can lead to a recurrence of symptoms.

Additionally, while your immune system may build protection against the specific strain you initially had, it won’t necessarily protect you from other norovirus strains or different viruses, such as rotavirus.

One older study found that immunity to stomach viruses, especially norovirus, is often weak and doesn’t last long. Immunity to norovirus, for instance, may last only a few months to a few years, varying widely between people.

This limited immunity means you could get ill again if exposed to the virus. In crowded places like daycare centers, cruise ships, or nursing homes, the chances of reinfection are even higher.

The American Academy of Allergy, Asthma & Immunology also notes that immune responses vary, with some people being more prone to recurring infections due to genetic factors, immune health, or underlying conditions.

Although it’s rare, a 2020 study suggests it’s possible to catch the same stomach bug like norovirus twice. Infections occurring within 30 days were generally considered markers of a persistent infection rather than a new one and were excluded from the study.

A 2023 study also found that after infection with a specific norovirus strain, the immune system develops temporary immunity, which lowers the risk of reinfection by the same strain for more than 2 and a half years.

However, if you’re unsure whether it’s a new infection or a relapse, consider speaking with a healthcare professional, who can perform tests to determine whether a different virus strain is involved.

Stomach viruses are highly contagious, but you can take steps to reduce your risk:

  • Wash your hands frequently with soap and water, especially before eating and after using the bathroom.
  • Avoid sharing personal items like utensils, towels, and cups.
  • Disinfect frequently touched surfaces like doorknobs and countertops using a bleach-based cleaner.
  • Stay home if you’re sick to prevent passing the virus to others.
  • Avoid preparing food for others until you’ve been symptom-free for at least 48 hours.

While most stomach bugs resolve on their own, consider getting medical help if you experience:

Can a stomach bug come back after a few days?

Yes, symptoms of a stomach bug can come back after a few days due to prolonged shedding, which can lead to a relapse or exposure to another type of stomach virus.

Can you pass the stomach flu back and forth?

Yes, it’s possible to pass the stomach flu (viral gastroenteritis) back and forth due to its contagious nature and viral shedding.

How can you tell the difference between norovirus and rotavirus?

Norovirus typically affects people of all ages and causes sudden onset of vomiting and diarrhea, while rotavirus more commonly affects infants and young children, often with fever and mucus in the stools. The only way to tell the difference between the two is through laraory testing.

Can you catch norovirus twice in a week?

Yes, it’s possible to catch norovirus twice in one week, especially if you’re exposed to different strains of the virus.

Getting a stomach bug twice in 2 weeks is possible due to exposure to different virus strains or frequent contact with contaminated surfaces or people who have it.

However, adopting prevention strategies, like practicing healthy hygiene, disinfecting surfaces, and avoiding shared items, can help reduce the risk.

If your stomach virus symptoms keep coming back or get worse, consider speaking with a healthcare professional for further evaluation and management.