TABLE 3.

Ct values for M. pneumoniae dilution series after duplex real-time PCR amplification with and without the PhHV spike

CCU of M. pneumoniae/ml	Ct value
	Without spike	With spike
10,000	27.9	28.2
1,000	32.1	31.6
100	35.1	35.3
10	39.4	40.3