TABLE 4.

Amplification of comC by PCR from streptococcal strains^a

Groupb	No. of PCR-positive strains/ total no. of strains tested
Mitis
S. pneumoniae	60/60
S. mitis	4/14
S. oralis	1/7
S. sanguis	0/4
S. parasanguis	0/1
S. cristae	0/2
Anginosus	0/6
Salivarius	0/2
Other	0/15

^aPurified streptococcal DNA was screened with primers 3 and 4. 

^bFull details of the strains examined are given in Materials and Methods.