TABLE 1.

Histological analysis of infected lungs

Time of analysis (days postinfection)	Histological characteristics in mouse lungs
	BALB/c	DO11.10	SCID
14	Mild small lesions, lymphocytes, macrophages	Mild small lesions, foamy macrophages, lymphocytes, some neutrophils	Mild interstitial pneumonia
28	Mild small lesions, macrophages, lymphocytes	Mild small lesions, few macrophages, interstitial pneumonia.	Mild interstitial pneumonia
40	Moderate small organized lesions, macrophages, lymphocytes	Moderate small macrophage lesions, plus neutrophils, scattered lymphocytes, interstitial pneumonia.	Extensive disorganized lesions, macrophages and neutrophils
60	Moderate small organized lesions, foamy macrophages and lymphocytes	Extensive lesions, foamy macrophages, neutrophils, scattered lymphocytes, interstitial pneumonia.	Extensive lesions, macrophages and neutrophils, necrosis