Table 2. Mean DNA copies of Rickettsia prowazekii in peripheral blood and various tissues sampled from doxycycline-treated or non-treated mice with dexamethasone-reactivated typhus infections.

	Mean DNA copies/µL blood or mg tissue (no. mice positive/no. tested)
Sample	Primary infection treated with doxycycline	Without doxycycline
Blood	24 (1/6)	73 (7/8)
Liver	ND	80 (2/5)
Spleen	ND	910 (2/5)
Lungs	338 (1/6)	276 (2/5)
Brain	ND	374 (2/5)

ND: no DNA detected.