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  Epidemiology

Epidemiology:

Pharyngitis and respiratory infections Group A streptococci are generally transmitted from person to person, through respiratory or saliva droplets. Epidemics of streptococcal pharyngitis caused by contaminated drink or food have also been documented. Widespread pasteurization has very much reduced reports of infection by contaminated milk. Contamination of food by infected respiratory secretions is thought to be the most general cause of food borne streptococcal infection, though skin infections of those handling food might also be the ultimate source of contamination. Streptococci existed on clothing, bedding or in dust do not appear to add to the spread of pharyngitis. Crowded conditions taking place in schools, military barracks and in indoor atmospheres in cold weather, favor the spread of streptococci.

The occurrence of scarlet fever situation parallels the dissemination of pharyngitis-related, toxin-generating Str. pyogenes strains.

Acute rheumatic fever and acute glomerulonephritis:

Acute rheumatic fever and acute glomerulonephritis take place as non-suppurative sequelae of infection through Str. pyogenes. Rheumatic fever might follow streptococcal pharyngitis though not cutaneous infection, while glomerulonephritis is preceded by either throat or skin infection.

 

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