Histopathology score based on immunohistochemistry of respiratory tissues of hamsters inoculated with Nipah virus.

Hamsters were inoculated intranasally with 103, 105 or 107 TCID50; three hamsters per dose per time point were sampled except for the 107 TCID50 group at 4 dpi, when only 2 animals remained; each column represents one animal.Score: 0: no immunopositivity; 1: 1 to 25% of tissue immunopositive; 2: 26 to 50% of tissue immunopositive; 3: 51 to 75% of tissue immunopositive; 4: 76 to 100% of tissue immunopositive.