Norovirus Levels Rising in Bay Area Amid Upcoming FIFA World Cup
Norovirus, often called the stomach flu or the “cruise ship virus,” remains prevalent in various areas of the Bay, and health officials predict that cases might rise with the upcoming FIFA World Cup.
Monitoring by WastewaterSCAN indicates that norovirus traces are notably high in places like Palo Alto, San Jose, Fremont, Vallejo, and Novato as of Thursday. Other areas, including San Francisco, show moderate levels of the virus.
However, Dr. Matthew Willis, a former health officer for Marin County, noted it’s still too soon to determine whether we might face a difficult summer. While norovirus circulates year-round, he mentioned that the rates are currently “higher than we normally see in June,” and this is “true for multiple jurisdictions at once.”
He pointed out that this pattern appears to be more widespread across the region. With international visitors coming to the Bay Area for the World Cup this summer, he emphasized the need for good hand hygiene.
Health experts classify the norovirus as “extremely contagious,” causing symptoms such as vomiting, stomach cramps, and diarrhea. The virus can easily spread in places like medical facilities, childcare centers, restaurants, and cruise ships. According to the Centers for Disease Control and Prevention (CDC), norovirus is responsible for 90% of diarrheal outbreaks on cruises, hence its unfortunate nickname. Due to shared dining areas and confined spaces on ships, controlling outbreaks can be quite challenging. Every year, the U.S. reports approximately 2,500 norovirus outbreaks.
Another worrying factor is that it only takes about 10 viral particles to make someone sick, while the flu requires thousands. Dr. Willis commented on its remarkable infectiousness.
Furthermore, the persistency of the virus is concerning; it can linger on surfaces for days and resist many common cleaning agents. For this reason, the CDC recommends using a chlorine bleach solution for effective disinfection. Hand sanitizer is generally not effective against norovirus, so thorough handwashing with soap and water is advised. The virus can also remain in feces for over two weeks after symptoms subside, posing an ongoing risk of transmission during that time. Symptoms usually emerge 12-48 hours after exposure and can last for up to three days.
The virus endures extreme temperatures, surviving up to 145 degrees, and simply steaming contaminated food won’t eliminate it. Dr. Willis cautioned that even a small amount of the virus can lead to more cases, advising that if someone at home is infected, family members should “obsessively” wash their hands.
For further details on preventing the spread of norovirus, visit the CDC’s website.
