OH, YES, this is a must read for sinus suffers

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CHRONIC SINUSITIS

When acute sinusitis fails to resolve and becomes chronic, cultures may reveal a

variety of opportunistic pathogens including anaerobic bacteria. Some

authorities feel that the problem is no longer mainly " infectious " but rather

reflects permanent mucosal injury. It has been estimated that chronic sinusitis

causes morbidity, measured as absenteeism from school, work, or social

activities, of the same magnitude as heart disease and arthritis.

Complications include remodeling of the facial bones, osteomyelitis,

and¯occasionally¯invasive disease of the CNS caused by bacteria or fungi.

http://pathmicro.med.sc.edu/Infectious%20Disease/Upper%20respiratory%20tract.htm