EVERYDAY SCIENCE

Detailed explanation-1: -Streptococci are Gram-positive, nonmotile, nonsporeforming, catalase-negative cocci that occur in pairs or chains. Older cultures may lose their Gram-positive character. Most streptococci are facultative anaerobes, and some are obligate (strict) anaerobes.

Detailed explanation-2: -Streptococcus pyogenes (Group A streptococcus) is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells. Individual cells are round-to-ovoid cocci, 0.6-1.0 micrometer in diameter (Figure 1).

Detailed explanation-3: -Streptococci are spherical organisms that grow in chains because of incomplete separation after division of the cells (Figure 1).

Detailed explanation-4: -Group A strep pharyngitis is most commonly spread through direct person-to-person transmission. Typically, transmission occurs through respiratory droplets but can also occur through contact with secretions, such as saliva, wound discharge, or nasal secretions, from an infected person.

Detailed explanation-5: -Streptococci are non-motile, microaerophilic, Grampositive spherical bacteria (cocci). They often occur as chains or pairs and are facultative or strict anaerobes.