Effects have included widespread respiratory illnesses and the closure of airports due to poor visibility.

To the Editor: Depression may be our most widespread and undertreated illness.

Health authorities have recognized with increasing alarm just how widespread the illness is.

Other widespread illnesses in Chad include diarrhea and upper respiratory infections.

Smog has been found to cause widespread respiratory illness, to create haze and damage crops.

Occasionally, a rash is a sign of a more widespread illness.

It said that adolescents suffered from widespread mental illness.

Besides the widespread illness, several other mysterious events occurred.

The unsanitary conditions led to widespread illness and it was decided to open the Infirmary.

A1 A genetic basis for schizophrenia, the devastating and widespread mental illness, may have been found by an international research team.