TABLE 2.
Virus load (copies/ml) | No. positivea/tested | % Positive |
---|---|---|
>106 | 5/5 | 100 |
≦105 – <106 | 63/68 | 92 |
≦104 – <105 | 73/102 | 71 |
≦103 – <104 | 5/63 | 7 |
<103 | 4/34 | 11 |
At least one blue cell was observed within 2 weeks in positive isolates. A large amount of infection-competent virus was present in the culture supernatant thereafter.