Table 2 Incidence and severity of histopathological changes of lung tissues in PHMG-P-treated adult mice.

From: Comparison of repeated toxicity of polyhexamethyleneguanidine phosphate, a causative agent of humidifier disinfectant tragedy, in young and adult mice

  

Adult male

Adult female

Control

Low

High

Control

Low

High

 

Number of examined

4

4

4

4

4

4

 

Number of unremarkable

4

0

0

4

0

0

Alveolar bronchiolization

Count

0

2

4

0

4

4

 

Average severityb

0.00a

2.00

1.00

0.00

1.25

2.00

 

Scoringc

0.00

1.00

1.00

0.00

1.25

2.00

Foamy/alveolar macrophage

Count

0

4

4

0

4

4

 

Average severity

0.00

1.50

2.25

0.00

1.25

2.25

 

Scoring

0.00

1.50

2.25

0.00

1.25

2.25

Granulomatous inflammation/fibrosis

Count

0

4

4

0

4

4

 

Average severity

0.00

1.50

2.50

0.00

1.25

2.50

 

Scoring

0.00

1.50

2.50

0.00

1.25

2.50

Inflammatory cell infiltration

Count

0

4

4

0

4

4

 

Average severity

0.00

2.00

1.00

0.00

1.50

2.25

 

Scoring

0.00

2.00

1.00

0.00

1.50

2.25

Degeneration of bronchiolar epitheliums

Count

0

3

3

0

4

4

 

Average severity

0.00

1.33

2.67

0.00

1.25

2.25

 

Scoring

0.00

1.00

2.00

0.00

1.25

2.25

  1. a 0: no lesions; 1: minimal (< 20%); 2: slight (20–40%); 3: moderate (40–60%); 4: marked (60–80%); 5: severe (> 80%).
  2. bAverage severity: sum of severity grade of affected animals/number of affected animals.
  3. cScoring: sum of severity grade of examined animals/number of examined animals.