Table I.

Summary of histopathological findings.

Post-exposure (days)	Treatment	Total (n)	Alveolitis	Fibrosis	Phagocytosed nanoparticles
7	DM	7	0 (n = 7)	0 (n = 7)	0 (n = 7)
	2.5 µg BMWCNT	8	0 (n = 8)	0 (n = 8)	2 (n = 8)*
	2.5 µg FMWCNT	7	0 (n = 7)	0 (n = 7)	2 (n = 7)*
	40 µg BMWCNT	8	0 (n = 4)	0 (n = 5)	5 (n = 8)*
			2 (n = 1)	3 (n = 2)
			3 (n = 1)	4 (n = 1)
			4 (n = 2)
	40 µg FMWCNT	9	0 (n = 8)	0 (n = 8)	5 (n = 10)*
			2 (n = 1)	2 (n = 1)
56	DM	8	0 (n = 8)	0 (n = 8)	0 (n = 8)
	2.5 µg BMWCNT	8	0 (n = 8)	0 (n = 8)	2 (n = 8)*+
	2.5 µg FMWCNT	8	0 (n = 8)	0 (n = 8)	0 (n = 5)*+
					5 (n = 3)
	40 µg BMWCNT	8	0 (n = 3)*+	0 (n = 2)*+	2 (n = 2)*+
			2 (n = 1)	2 (n = 2)	4 (n = 3)
			4 (n = 4)	4 (n = 4)	5 (n = 3)
	40 µg FMWCNT	9	0 (n = 9)+	0 (n = 8)+	0 (n = 1)*+
				2 (n = 1)	2 (n = 6)
					4 (n = 1)
					5 (n = 1)

BMWCNT, bare multi-walled carbon nanotubes; DM, dispersion medium; FMWCNT, functionalised multi-walled carbon nanotubes.

Values represent histopathology score and inside parentheses the number of animals (n) with that score.

^*Significant difference between control and MWCNT group at the same post-exposure time.

⁺Significant difference between BMWCNT and FMWCNT groups at an equivalent mass dose at the same post-exposure time.