Illinois is experiencing a substantial surge in influenza cases, resulting in increased hospitalizations and concerns over a newly circulating variant. Health officials are issuing urgent warnings and emphasizing preventative measures like vaccination and self-isolation when ill.

Flu Activity Reaches “Very High” Levels

The Illinois Department of Public Health (IDPH) and local health departments in the Chicago area have issued warnings as hospital admissions and positive influenza tests dramatically increase statewide. On Monday, officials reported that flu activity is considered “very high” in Illinois. Tragically, the state has also reported its first influenza-related pediatric death this season.

Understanding Contagiousness and Isolation

With a new, mutated influenza variant spreading rapidly, minimizing transmission is crucial. Dr. Mark Loafman, chair of Family and Community Medicine at Cook County Health, recommends individuals infected with the flu stay home for up to ten days. He explained that peak viral shedding typically occurs within the first five to seven days of symptoms.

Practical Isolation Guidelines

While a ten-day isolation is ideal, Dr. Loafman noted that diligent mask-wearing around vulnerable individuals or in crowded spaces during the first seven days, combined with rigorous hand hygiene, can be effective. The Centers for Disease Control and Prevention (CDC) states people are generally contagious around three days into their infection, though this varies. Young children and those with weakened immune systems may be contagious for longer periods.

Symptoms and Concerns

The current surge has significantly increased hospital admissions and emergency room visits, with respiratory illnesses largely attributed to influenza. Dr. Loafman expressed concern about the outbreak’s trajectory, citing seasonal factors, indoor gatherings, and holiday travel as contributing factors. Dr. Santina Wheat of Northwestern Medicine anticipates a potential further increase in cases with children returning to school.

New Strain Presents Unique Symptoms

Medical professionals are observing unusually high fevers in many cases, sometimes lasting up to seven days, which is causing concern for patients. The new strain appears to present symptoms such as unusually high fevers, persistent and phlegmy coughs, vomiting, diarrhea, and widespread joint and muscle aches. While gastrointestinal symptoms are less common in adults, doctors are reporting increased instances.

Rose O’Keeffe, a Chicago resident, described her recent experience with the flu, reporting daily fevers, significant body aches, and congestion. It’s important to note that not everyone infected with the flu will experience a fever.

Critical Warning Signs

Doctors have identified three critical warning signs: high fevers unresponsive to medication, signs of shortness of breath (difficulty breathing and wheezing), and signs of dehydration, particularly in children and the elderly.

Public Health Response

IDPH Director Dr. Sameer Vohra acknowledged a “significant winter surge in seasonal respiratory illnesses with flu activity at very high levels.” He reinforced that vaccinations remain the most effective preventative measure against severe illness from the flu, COVID-19, and RSV.