What CDC’s Latest Respiratory Virus “Activity Levels” Mean for Families Right Now

CDC’s respiratory virus “Activity Levels” and “Illness Severity” dashboards can be confusing at first glance—especially when you see different signals (like emergency department visits, hospital admissions, and wastewater). Both pages were last updated July 6, 2026. The practical takeaway for families is simpler: use these indicators to plan prevention steps and give extra protection to people at higher risk, without panic.

Here’s what the CDC labels mean, why wastewater may sometimes shift before clinics do, and how to turn the data into calm, realistic actions at home, in schools, and at work.

What CDC means by “Respiratory Virus Activity Levels”

CDC’s “Activity Levels” are designed as a population-level snapshot of how much respiratory illness is showing up in care. In the CDC framework, activity is monitored using the acute respiratory illness (ARI) metric and related measures for COVID-19, influenza, and RSV. The dashboard groups activity into five categories: Very Low, Low, Moderate, High, and Very High.

What ARI is measuring: ARI is a broad, non-specific syndrome based on emergency department (ED) visits for respiratory illness complaints and diagnoses. It can range from milder infections (like common colds) to more severe infections (including COVID-19, influenza, and RSV).

How CDC creates the categories: CDC compares current-week ED visit percentages to reference “low activity” periods. The categories reflect how elevated the current week is compared with that baseline—not an exact count of “how many people are infected.”

What to remember: even when activity looks elevated, the dashboard still doesn’t tell you the exact number of infections in your specific neighborhood, and it doesn’t identify which virus is causing an individual’s illness.

How wastewater fits in (and why it can move first)

Alongside ED visit trends, the CDC includes a wastewater viral activity level map. Wastewater testing can detect viral traces circulating in a community even if some people don’t have symptoms. CDC describes wastewater as an early warning signal that can show whether infections may be increasing or decreasing before many people seek care.

Important limits to keep in mind:

Wastewater can’t determine the source of the virus (for example, it can’t tell whether viruses originated from humans vs. animals).
Influenza wastewater data are for Influenza A only—the dashboard does not distinguish between Influenza A subtypes.
Coverage representativeness can vary: CDC cautions that some wastewater estimates are based on a small segment of the population, which may make results less representative for a state/territory.
RSV may be harder to capture for some people: wastewater data for RSV may not include people who wear diapers, because their waste may be disposed outside the wastewater system.

A CDC peer-reviewed study helps explain why wastewater can align with clinical signals. In Oregon, researchers found strong, positive correlations between wastewater viral concentration and the percent of clinical tests that were positive for SARS-CoV-2, influenza, and RSV. The authors also note limits, including that wastewater surveillance excludes people without access to municipal sewer service (e.g., septic tanks) and that reporting patterns can differ by pathogen.

What CDC means by “Illness Severity” (hospital burden)

Where “Activity Levels” emphasize how much respiratory illness is showing up in care, Illness Severity focuses on hospitalization-related signals. CDC’s “Severe Viral Respiratory Illness” page tracks hospital admissions and hospitalization rates linked with COVID-19, flu, and RSV, and it flags when data completeness is limited (for example, showing Data unavailable when hospital reporting coverage is insufficient).

Practical meaning for families: if hospitalization-related indicators rise, it can suggest higher risk of severe outcomes and greater pressure on healthcare systems. But it still doesn’t mean every person who feels sick will need hospitalization.

How to use the dashboard at home, in schools, and at work

Instead of trying to predict your own infection timing from surveillance, use the dashboards for planning:

Check both “Activity” and “Severity”: higher spread signals can mean more routine illnesses in schools and workplaces, while higher severity signals suggest you may want to protect people at higher risk more deliberately.
Layer prevention when activity is elevated: AAP recommends practical infection-control strategies in schools, including frequent hand washing, cleaning/sanitizing surfaces, teaching cough/sneeze habits, and keeping rooms well ventilated.
Plan for “when someone is sick”: AAP advises excusing a child from class if they have fever, vomiting, or other symptoms (like cough, sore throat, sneezing, or runny nose) that prevent them from participating in activities and require extra care.
Make masks easier when needed: AAP notes schools can create an environment where mask wearing is normal and welcome, including considering making masks available for students and staff who want to wear one.

Higher-risk households: a “protect more” mindset

When respiratory virus activity is elevated, people at higher risk deserve extra planning. MedlinePlus lists several groups more likely to have flu complications, including adults 65 and older, pregnant women, children younger than 5, and people with certain chronic conditions such as asthma, diabetes, and heart disease (and other specified high-risk conditions).

For households with someone in a higher-risk group, consider shifting to “protect more” rather than waiting for symptoms to appear:

Be ready to improve ventilation and reduce crowding in shared indoor spaces.
During periods when both activity and severity are elevated, consider extra steps for crowded indoor settings.
Have a clear plan for what you’ll do if someone gets sick—who to call, where to go for care, and how you’ll protect others at home.

When to contact a clinician (symptom-based, not dashboard-based)

MedlinePlus guidance for flu emphasizes that most people with mild flu-like illness recover on their own, but people in a high-risk group and those who are very sick or worried should contact a healthcare provider. MedlinePlus also notes that antiviral medicines, when they are needed, usually work best when started within 2 days of getting sick.

If you’re unsure whether symptoms are “just a cold” or something more serious—or if symptoms are worsening—calling a clinician is a reasonable next step.

What remains uncertain

Surveillance signals don’t pinpoint individual timing: trend-based models can show whether infections are likely increasing or decreasing, but they don’t tell you the exact number of current infections in a household.
Wastewater is a community signal, not personal testing: it can be useful for early warning, but it can’t identify which virus is affecting which person in your home.
Data can have coverage gaps: CDC notes limitations such as reduced representativeness in wastewater estimates and “Data unavailable” when hospital reporting coverage isn’t sufficient.

Used correctly, CDC’s “Activity Levels” and “Illness Severity” are best thought of as a planning tool: they help families, schools, and workplaces decide when it makes sense to layer prevention and protect people at higher risk.

Key sources

Editorial note: Weence articles are researched from cited public-health, medical, regulatory, journal, and reputable news sources and may be drafted with AI assistance. They are checked for source support, clarity, and safety guardrails before publication.

This article is for general informational purposes only and is not medical advice. Research findings can be early or incomplete, and health guidance can change. Always talk with a qualified healthcare professional about personal symptoms, diagnosis, medications, vaccines, screenings, or treatment decisions. If you think you may have a medical emergency, call emergency services right away.