Over the past few weeks, Kenyans have taken to social media and casual conversations to complain about a mysterious and persistent flu that doesn't seem to go away.

The symptoms are striking - intense headaches, aching joints, fevers, sore throats, sneezing, coughs, and fatigue that sometimes linger for more than a week.

For many, the illness has been so severe that it has raised fears of a resurgence of COVID-19.

But experts now confirm that the culprit behind most of these symptoms is influenza A - and it's spreading fast.