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Original Article
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Volume 335:547-554 August 22, 1996 Number 8
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Invasive Group A Streptococcal Infections in Ontario, Canada
H. Dele Davies, M.D., Allison McGeer, M.D., Benjamin Schwartz, M.D., Karen Green, R.N., Darlene Cann, R.N., Andrew E. Simor, M.D., Donald E. Low, M.D., for The Ontario Group A Streptococcal Study Group

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ABSTRACT

Background Several reports suggest that the incidence of invasive group A streptococcal infections, including streptococcal toxic shock syndrome and necrotizing fasciitis, is increasing.

Methods During 1992 and 1993 we conducted prospective, population-based surveillance of invasive group A streptococcal disease in Ontario, Canada. We reviewed clinical and laboratory records, searched for secondary cases of invasive disease, and cultured specimens from household contacts.

Results We identified 323 patients with invasive group A streptococcal infections, for an annual incidence of 1.5 cases per 100,000 population. The rates were highest in young children and the elderly. Fifty-six percent of the patients had underlying chronic illness. Risk factors for disease included infection with the human immunodeficiency virus, cancer, diabetes, alcohol abuse, and chickenpox. The most common clinical presentations were soft-tissue infection (48 percent), bacteremia with no septic focus (14 percent), and pneumonia (11 percent). Necrotizing fasciitis occurred in 6 percent of patients, and toxic shock in 13 percent. The mortality rate was 15 percent overall, but it was 29 percent among those over 64 years of age (P<0.001) and 81 percent among those with toxic shock (P<0.001). Fourteen percent of the cases were nosocomial, and 4 percent occurred in nursing home residents, often in association with disease outbreaks. Invasive disease occurred in 2 household contacts of patients with infection, for an estimated risk of 3.2 per 1000 household contacts (95 percent confidence interval, 0.39 to 12 per 1000).

Conclusions The elderly and those with underlying medical conditions are at greatest risk for invasive group A streptococcal disease, toxic shock, and necrotizing fasciitis. Invasive streptococcal infection is associated with a substantial risk of transmission in households and health care institutions.


Source Information

From the Division of Infectious Diseases, Hospital for Sick Children (H.D.D.), the Department of Microbiology, Mount Sinai and Princess Margaret Hospitals (A.M., K.G., D.C., D.E.L.), and the Department of Microbiology, Sunnybrook Health Sciences Centre, University of Toronto (A.E.S.) — all in Toronto; and the Centers for Disease Control and Prevention, Atlanta (B.S.).

Address reprint requests to Dr. Low at the Department of Microbiology, Mount Sinai Hospital, 600 University Ave., Toronto, ON M5G 1X5, Canada.

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Related Letters:

Invasive Group A Streptococcal Infections
Couper R., Charytan D., Kujath P., Eckmann C., McGeer A., Low D. E., Davies H. D., Schwartz B., Holm S. E.
Extract | Full Text  
N Engl J Med 1997; 336:513-515, Feb 13, 1997. Correspondence

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