Infection with group A streptococci that is characterized by tonsillitis and pharyngitis. An erythematous rash is commonly present.

A species of gram-positive, coccoid bacteria isolated from skin lesions, blood, inflammatory exudates, and the upper respiratory tract of humans. It is a group A hemolytic Streptococcus that can cause SCARLET FEVER and RHEUMATIC FEVER.

A febrile disease occurring as a delayed sequela of infections with STREPTOCOCCUS PYOGENES. It is characterized by multiple focal inflammatory lesions of the connective tissue structures, such as the heart, blood vessels, and joints (POLYARTHRITIS) and brain, and by the presence of ASCHOFF BODIES in the myocardium and skin.

BIRDS of the large family Psittacidae, widely distributed in tropical regions and having a distinctive stout, curved hooked bill. The family includes LOVEBIRDS; AMAZON PARROTS; conures; PARAKEETS; and many other kinds of parrots.

Toxins produced, especially by bacterial or fungal cells, and released into the culture medium or environment.

Infections with bacteria of the genus STREPTOCOCCUS.

An abnormal elevation of body temperature, usually as a result of a pathologic process.

Sudden increase in the incidence of a disease. The concept includes EPIDEMICS and PANDEMICS.