The illness is typically characterised by an influenza-like illness and polyarthritis.

It is reported that, in approximately one-third of the cases, an influenza-like illness preceded the development of the disorder.

The 2013 flu season has been particularly harsh in the United States, where the majority of the country was reporting high rates of influenza-like illness.

Influenza is a relatively uncommon cause of influenza-like illness.

The diagnosis of influenza-like illness can be made based on the signs and symptoms; however, confirmation of an influenza infection requires testing.

A later study found that the same procedure did not prevent influenza-like illnesses.

During an epidemic, 60-70% of patients with a clear influenza-like illness actually have influenza.

Records show that the men, miners in their 20's, died of an influenza-like illness that was ravaging the world.

During the initial infection, a person may experience a brief period of influenza-like illness.

Many individuals develop an influenza-like illness or a mononucleosis-like illness 2-4 weeks post exposure while others have no significant symptoms.