Weight loss after H5N1, H9N2 and H7N1 challenge.

<p>Mice were immunized twice, three weeks apart, with MVA vectors and challenged three weeks later with (<b>A and B</b>) 42 LD₅₀ of H5N1 VN1203, (<b>C</b>) 32 LD₅₀ of mouse-adapted H9N2 HK/G9 or (<b>D</b>) 16 LD₅₀ of H7N1 RO/34. (<b>B</b>) Primed mice were infected intranasally with 100 TCID₅₀ H1N1pdm09 virus, six weeks before immunization. Animals were monitored for 14 days after challenge. Shown are the daily variations in weight, as percentages compared to before virus challenge.