IL10 and infection: Infection of both genetically resistant (C57BL/6 and BALB/c) and susceptible (CBA/J) mice with a common laboratory strain of M. tuberculosis (H37Rv or Erdman) induces detectable levels of Il10 mRNA in the lungs within the first 3–4 wk postinfection (27–29), although higher levels of IL-10 were detected in the lungs of susceptible mice during chronic infection (27).