how long does a strep culture take to grow
1 Group A streptococcus. 2  This bacteria can cause strep throat, scarlet fever, and rheumatic fever. 3  If strep throat is likely, a test called a rapid strep test (or quick strep) may be done before a throat culture. 4  With a rapid strep test, results are ready in 10 minutes instead of 1 to 2 days with a throat culture.