TABLE 3.

Tissue biopsy histological grading for burn wound infection^a

Grade	Histological description
0	No microorganisms observed throughout the section
I	Microorganisms limited to burn wound surface
Ia	Contamination by a few bacteria
Ib	Colonization by numerous organisms
II	Microorganisms penetrated superficial dermis
III	Bacterial colonization observed throughout dermis
IV	Important microbial invasion occurred in burn wound eschar of subjacent viable tissue and hypodermis

^aData are from reference 294.