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Rickettsia raoultii infection rate curves in two replicate cultures in each of the tick cell lines BME/CTVM23, RSE/PILS35 and IDE8. (A): R. raoultii-infected BME/CTVM23 cultures, (B): R. raoultii-infected RSE/PILS35 cultures, (C): R. raoultii-infected IDE8 cultures. The infection rates were calculated based on the percentage of infected cells observed among 200–300 cells counted in Giemsa-stained cytocentrifuge smears prepared at the indicated days post infection.
