Ultrastructural studies on the respiratory tract of mice inoculated intranasally with L-fermentum

The ultrastructural. modifications of the respiratory tract of mice produce d by the intranasally inoculated L. fermentum was evaluated. The genus Lact obacillus has been largely studied from the probiotic effect point of view in different ecological systems. Lactobacilli inoculated in 4 intranasal do ses (1x10(9)CFU/ dose) do not produce fundamental changes at the ultrastruc tural level in the organs of the respiratory tract studied. The most import ant finding was the presence of a cellular type with intracellular structur es surrounded by membranes exhibiting electron dense paracristalline materi al parallel arranged.