Table 2.

Results of conventional microscopy and single and nested PCRs and correlation with clinical evidence for PCP in patients with acute respiratory symptoms for samples and patients

Patient statusTotal no. of samples (total no. of patients)No. of samples (no. of patients) that were:
Nested- PCR positiveSingle- PCR positiveMicroscopy positivePositive clinically for P. cariniia
HIV positive134 (89)39 (21)31 (20)28 (20)38 (20)
Transplant recipient144 (61)20 (10)10 (5)6 (3)6 + 2 (3 + 1)
Malignancy115 (66)17 (11)10 (6)3 (2)4 + 2 (2 + 2)
Immunosuppressed52 (34)11 (7)4 (2)3 (1)3 + 1 (1 + 1)
Immunocompetent129 (84)16 (14)2 (2)0 (0) 0 (0)
  • a Figures added by a plus sign represent possible cases of P. carinii infection as defined in Materials and Methods.