Figure 3: TB/HIV coinfection. Negative: no Acid-Fast Bacilli (AFB) seen in at least 100 fields; scanty (sc): 1–9 AFB found in 100 fields; (1+): 10–99 AFB found in 100 fields; (2+): 1–10 AFB found per field in at least 50 fields; (3+): more than 10 AFB per field in at least 20 fields.