Severe acute respiratory syndrome ( SARS ) is a recently described infectious entity with salient features of fever , headache and malaise , with rapid progression to pneumonitis .
During the winter of 2003 , an outbreak of SARS <*> occurred in Toronto , Canada .
Severe acute respiratory syndrome ( SARS ) is a recently described infectious entity with salient features of fever , headache and malaise , with rapid progression to pneumonitis .
During the winter of 2003 , an outbreak of SARS involving several hospitals occurred in Toronto , Canada .