PVM-susceptibility gene distribution between parental strains.

<p>LVL<sup>d7</sup>, day 7 pi lung viral load; ΔBW<sup>d0–d7</sup>, body weight loss as measured 7 days pi; ΔEB<sup>d6–d7</sup>, change in expiratory balance between days 6 and 7 pi. P1 and P2, mean value of PVM-resistant (SJL/J) and PVM-susceptible (129/Sv) strain, respectively. Testing according to Mather and Jinks (1982). See Materials & Methods section for key.</p>