Fig 1.

Growth of Rickettsia helvetica AS819 in Vero E6 (A) and L929 (B) cell cultures. Genome equivalents measured by quantitative gltA PCR of infected cell cultures are given at several time points during infection. The values from triplicate infected cultures were averaged; standard deviation error bars are given. Growth studies using Vero E6 (A) and L929 (B) were performed simultaneously. ● indicate gltA-copies/μl template-DNA purified from cell layers, and ■ represent gltA-copies/μl template-DNA obtained from culture supernatants.