Table 1.

Numbers of chickens presenting air sacculitis and/or infected with M. gallisepticum^a

Infection group	No. of birds with AS lesions	AS lesion score		No. of birds in which M. gallisepticum was recovered
		Total	Per bird	RT	IO	Total
Medium	0	0	0	0	0	0
Rlow	30	220	7.33	30	28	30
Rhigh	3	4	1.33	26	7	26
RCL2	19 L,H,M	40 L,H,M	2.1	30 M	14 L,H,M	30 M
mHAD3	8 L,C	12 L,H,C	1.5 L	17 L,H,C	5 L,C	17 L,H,C

^aAbbreviations: AS, air sac; RT, respiratory tract; IO, inner organs. The letters L, H, C, and M indicate values significantly different (P ≤ 0.05) from those obtained for birds infected with R_low, R_high, RCL2, or mHAD3, respectively.