Table 3 Positivity frequency of four human herpesviruses across all brain specimens
| Â | CMV | HHV-6A | HHV-6B | EBV | |
|---|---|---|---|---|---|
FFPE-Preserved Tissue | Â | Â | Â | Â | Â |
|  | Astrocytoma Grade IV (n = 19) | 0/19 | 0/19 | 3/19 (15.8 %) | 4/19 (21.1 %) |
|  | Astrocytoma Grade III (n = 2) | 0/2 | 0/2 | 0/2 | 0/2 |
|  | Astrocytoma Grade II (n = 1) | 0/1 | 0/1 | 0/1 | 0/1 |
|  | Astrocytoma Grade I (n = 4) | 0/4 | 0/4 | 0/4 | 0/4 |
|  | Control (n = 17) | 1/17 (5.9 %) | 0/17 | 0/17 | 0/17 |
OCT-Preserved Tissue | Â | Â | Â | Â | Â |
|  | Astrocytoma Grade IV (n = 20) | 0/20 | 0/20 | 3/20 (15 %) | 0/20 |
|  | Astrocytoma Grade III (n = 10) | 0/10 | 0/10 | 2/10 (20 %) | 0/10 |
Fresh Frozen Tissue | Â | Â | Â | Â | Â |
|  | Astrocytoma Grade IV (n = 6) | 0/6 | 0/6 | 0/6 | 0/6 |
|  | Astrocytoma Grade II (n = 1) | 0/1 | 0/1 | 0/1 | 0/1 |
|  | Control (n = 32) | 0/32 | 0/32 | 2/32 (6.2 %) | 0/32 |