Surge in Flu, RSV, and Norovirus Cases Observed in Chicago

As the holiday season continues, residents of Chicago are facing a rise in respiratory illnesses, particularly influenza and respiratory syncytial virus (RSV), along with an uptick in norovirus cases. The latest surveillance report from the Chicago Department of Public Health indicates a significant increase in flu activity, while RSV levels remain notably high. Although COVID-19 cases are on the rise, they are currently at lower levels compared to previous years.

Data shows that the positivity rate for flu tests in Chicago reached 11.2% for the week ending December 21, a marked increase from 2.6% just two weeks prior. Emergency department visits related to flu symptoms also rose, accounting for approximately 2.8% of all visits during that week.

Statewide trends reveal similar patterns, with both flu and RSV test positivity rates climbing. Meanwhile, national reports indicate a worrying increase in norovirus outbreaks, characterized by symptoms such as vomiting and diarrhea. The Illinois Department of Public Health is currently assessing these norovirus reports and has noted that cases appear slightly higher than pre-pandemic levels.

Health officials emphasize the importance of vigilance without causing undue alarm. They suggest that the current wave of illnesses aligns with typical cold and flu seasons. Dr. Laura Zimmermann, a physician at Rush University System for Health, stated that while personal experiences with viral infections may seem severe, they reflect the usual fluctuations in viral activity during winter months.

In response to the rising respiratory illnesses, the Illinois Department of Public Health has recommended healthcare facilities adopt widespread masking protocols to protect patients. Local hospitals, including UChicago Medicine, are urging staff and visitors to wear masks in patient areas to minimize the risk of transmission.

RSV is notably concerning for infants and the elderly, while the overall hospitalization rates for RSV in Chicago remain lower than during the peak seasons of previous years. At Lurie Children's Hospital, 23 children were hospitalized due to RSV as of the latest reports, with around half receiving intensive care.

Overall, the positivity rate for RSV tests in Chicago was reported at nearly 15% for the week ending December 21, compared to 8.5% during the same time last year. Similarly, statewide RSV positivity rose to 13.5% from the previous 10.6% two weeks before.

COVID-19, while increasing, is currently not at alarming levels. At Edward Hospital, out of approximately 250 patients, around 40 were noted to have various viral infections, with a third testing positive for COVID-19 and another third for influenza.

Healthcare professionals assert the rise in respiratory illnesses is expected during winter. However, the increase in norovirus cases is slightly atypical for this time of year, with the CDC reporting a significant rise in confirmed outbreaks across multiple states.

The Chicago Department of Public Health does not track individual norovirus cases but has noted several small outbreaks reported in December. Preventative measures include thorough handwashing and self-isolation for those exhibiting symptoms.

To mitigate the spread of flu and COVID-19, health officials continue to advocate for annual vaccinations. Vaccination can reduce the likelihood of severe illness if exposed. Furthermore, adults aged 75 and older, as well as those aged 60 to 74 at increased risk, are encouraged to receive RSV vaccinations. Infants may receive RSV antibodies if their mothers were not vaccinated during pregnancy.

In summary, as Chicago navigates through this season of increased viral activity, healthcare experts recommend continued caution and preventative measures to safeguard public health.