TABLE 1.

Results of Ziehl-Neelsen staining of sputum smears prepared by USP and direct methods

Smear method and resultaNo. of smearsCulture resultb (no. of samples)
PositiveNegative
USP
    3+2152087
    2+78753
    1+33303
    Scantyc1798
    Any positive34332221
    Negative2286222
    Total571328243
Direct
    3+47461
    2+70664
    1+97943
    Scanty291910
    Any positive24322518
    Negative328103225
    Total571328243
  • a 3+, >10 AFB per oil immersion field (OIF) (at least 20 fields); 2+, 2 to 10 AFB per OIF (at least 50 fields); 1+, 1 to 99 AFB in 100 OIF; scanty, 1 to 9 AFB in 100 OIF (40).

  • b Using USP, CDC, or modified Petroff method.

  • c All were negative by direct smear microscopy.