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Table 2 Performance of serology and PCR at first visit in patients with MP infection in relation to duration of illness.

From: Polymerase chain reaction is superior to serology for the diagnosis of acute Mycoplasma pneumoniae infection and reveals a high rate of persistent infection

Days after onset of illness MP cases detected by PCR (%) MP cases detected by serology. Results of the first serum (%)
  Negative Positive Negative Positive
1 – 7 0 17 (100) 10 3 (23)
8 – 14 1 23 (96) 8 10 (56)
15 – 21 0 8 (100) 0 6 (100)
22 – 28 2 5 (71) 5 1 (17)
> 28 0 8 (100) 2 9 (82)
Total 3 61 (95) 25 29 (54)