The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 109, 257-270, Copyright, 1959, by The Rockefeller Institute

ARTICLE

THE RELATIVE IMPORTANCE OF THE CAPSULE AND THE M-ANTIGEN IN DETERMINING COLONY FORM OF GROUP A STREPTOCOCCI

Armine T. Wilson M.D.1

1 From the Alfred I. du Font Institute of the Nemours Foundation, Wilmington, Delaware

Evidence is presented showing that the surface configuration of Group A streptococcal colonies depends largely on whether or not the cocci form a capsule. Strains which form capsules during growth on agar produce mucoid or matt colonies. Strains that do not form capsules during growth on agar produce glossy colonies. Whether or not M antigen is formed by the growing cocci appears to have no direct effect on surface configuration of the colony, although there is an indirect and partial association between M production and the mucoid-matt variant state and between M deficiency and the glossy variant state.

Submitted on November 30, 1958


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