Table 1.

Grading criteria used in this study

Grade	Criteria	Interpretation
0+	Neutrophils Absent	Not infected
1+	1 cell per 10 hpfs (high power (×400) fields)	Not infected
2+	2 to 5 cells per 10 hpfs	Not infected
3+	6 to 10 cells per 10 hpfs	Borderline probably not infected
4+	> 10 cells per 10 hpfs but less than 3 hpfs with 5 or more cells	Borderline probably infected
5+	5 or more cells per hpf in at least 3 fields	Infected
	General lymphocytes or plasma cells
0+	< 10 cells per hpf
1+	11 to 30 cells per hpf
2+	31 to 50 cells per hpf
3+	51 to 100 cells per hpf
4+	> 100 cells per hpf
	Layers of lymphocytes	Number of vessels involved
0+	Absent	Absent
1+	1 to 3 layers around vessels per hpf	1 to 2
2+	4 to 10 layers around vessels per hpf	3 to 6
3+	> 10 layers around vessels per hpf	7 to 10
4+		> 10