Figure 4

The estimated date of the introduction of H7N9 onto the patient's farm and the reassortment event that led to human infection.

The red circles and blue bars represent the estimated TMRCA and 95% CI, respectively, of each gene segment of the viruses isolated from the patient's farm; the black circles and orange bars represent the TMRCA and 95% CI, respectively, of each gene segment of the viruses isolated from the farm and the closest relatives sampled elsewhere; the black triangles and dotted lines represent the TMRCA of each gene segment of the human virus and the closest avian viruses isolated from the farm. The black arrows pointing to the grey line represent the dates of the seven batches of introduced poultry. The green column represents the upper and lower bounds of the introduction date of H7N9 onto the farm. The magenta column represents the upper and lower bounds of the reassortment event that led to the human strain occurrence.