What happened?
CDC Week 39 (week ending 2026-10-03) reports seasonal influenza activity remains low nationally but has been increasing since late August/early September. Public health laboratories reported 204 influenza viruses that week: 201 influenza A and 3 influenza B. Of 127 subtyped A viruses, 125 (98.4%) were A(H1N1)pdm09, predominantly HA subclade D.3.1.1.
Why does it matter?
Several surveillance indicators — percent test positivity, outpatient visits for influenza‑like illness and hospital admission rates — have edged up, particularly in HHS regions 9 and 10 (West Coast). These signs point to earlier‑than‑average seasonal activity in parts of the US, though still within expected seasonal variation. No new novel influenza infections were reported that week.
How to interpret the evidence
This is national US surveillance describing which virus types and subclades are circulating and where activity is increasing. It does not automatically reflect the situation in Malta or the EU. Local public health authorities and national surveillance data should be consulted to assess local relevance, vaccine recommendations and antiviral availability.
What remains uncertain?
A rise from a low baseline does not imply a large or widespread outbreak: overall activity remained modest and within expected seasonal variation. The data are preliminary and may be revised as reports arrive. The report does not indicate new regulatory approvals, vaccine composition changes or guaranteed local availability for EU/Malta populations.
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This summary was prepared with AI assistance and checked automatically against the linked primary source. It has not been individually reviewed by a clinician.