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
Background Several reports suggest that the incidence of invasivegroup A streptococcal infections, including streptococcal toxicshock syndrome and necrotizing fasciitis, is increasing.
Methods During 1992 and 1993 we conducted prospective, population-basedsurveillance of invasive group A streptococcal disease in Ontario,Canada. We reviewed clinical and laboratory records, searchedfor secondary cases of invasive disease, and cultured specimensfrom household contacts.
Results We identified 323 patients with invasive group A streptococcalinfections, for an annual incidence of 1.5 cases per 100,000population. The rates were highest in young children and theelderly. Fifty-six percent of the patients had underlying chronicillness. Risk factors for disease included infection with thehuman immunodeficiency virus, cancer, diabetes, alcohol abuse,and chickenpox. The most common clinical presentations weresoft-tissue infection (48 percent), bacteremia with no septicfocus (14 percent), and pneumonia (11 percent). Necrotizingfasciitis occurred in 6 percent of patients, and toxic shockin 13 percent. The mortality rate was 15 percent overall, butit was 29 percent among those over 64 years of age (P<0.001)and 81 percent among those with toxic shock (P<0.001). Fourteenpercent of the cases were nosocomial, and 4 percent occurredin nursing home residents, often in association with diseaseoutbreaks. Invasive disease occurred in 2 household contactsof patients with infection, for an estimated risk of 3.2 per1000 household contacts (95 percent confidence interval, 0.39to 12 per 1000).
Conclusions The elderly and those with underlying medical conditionsare at greatest risk for invasive group A streptococcal disease,toxic shock, and necrotizing fasciitis. Invasive streptococcalinfection is associated with a substantial risk of transmissionin 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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