Table 2.

Bacterial strains initially chosen for the study of intra-species interactions.

Strain	Serotype	MLST1	Observation2	Reference
D39	2	595	selected	(Avery et al., 1944)
TIGR4	4	205	selected	(Tettelin et al., 2001)
2099	3	260	–	(Nunes et al., 2016)
7632	15A	8322	selected	(Nunes et al., 2016)
5262.1	19A	276	–	(Sá-Leão et al., 2009)
5902	19A	63	–	(Simões et al., 2011)
1990	19F	177	selected	(Nunes et al., 2016)
5756	22F	433	selected	(Sá-Leão et al., 2009)
8046	22F	9161	–	(Nunes et al., 2016)
8276	33F	717	–	(Félix et al., 2021)
5262.2	NT	344	–	(Sá-Leão et al., 2009)
5435	NT	344	selected	(Sá-Leão et al., 2009)
7031	NT	344	selected	(Nunes et al., 2016)
6209	NT	4583	selected	(Simões et al., 2011)

MLST, multilocus sequence typing; NT, non-typeable (non-encapsulated). ¹STs mainly associated with colonization isolates (www.pubmlst.org).

²Strains tested in dual-strain biofilms are indicated as “selected”. Other stains did not meet one or more validation criteria and were excluded.