Other Streptococcal Infections

Although Streptococcus pyogenes is found in the upper respiratory tract of many people, sometimes (virulent strains or weakened hosts) it causes the disease known as strep throat. In addition to a sore throat, this may lead to tonsillitis, and in some cases ear infections (otitis media). If not treated, some strains produce a toxin leading to damage of small blood vessels, a fever, and a rash, a disease known as scarlet fever. A few strains may produce rheumatic fever, which can lead to heart, kidney, and joint damage.

Figure 12.8 Bills of Mortality, published by the Company of Parish Clerks in London, England in 1665.

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