Chart 1. Method for evaluating vaginal smears stained by the Gram method in the diagnosis of bacterial vaginosis.

Bacterial morphology	Points by morphological type
	0	1+	2+	3+	4+
Large Gram Bacillus (+) (Lactobacilli)	4	3	2	1	0
Small Gram Bacillus (-)	0	1	2	3	4
Curved Gram Bacillus (-)	0	1 or 2	3 or 4	2	2

Source: Modified from Nugent et al. (1991).⁽³⁶⁾