Use of pulsed-field gel electrophoresis for investigation of a cluster of invasive group a streptococcal illness—Spokane, Washington, 1999

[Centers for Disease Control and Prevention. Use of pulsed-field gel electrophoresis for investigation of a cluster of invasive group A streptococcal illness—Spokane, Washington, 1999. MMWR Morb Mortal Wkly Rep. 1999;48:681-683.]