Experimental reproduction numbers disentangle vaccine effects on susceptibility and infectiousness during H5N1 transmission in geese
This study demonstrates that experimental reproduction numbers derived from controlled transmission trials in geese can effectively disentangle the distinct effects of an H5N1 vaccine on host susceptibility and infectiousness, revealing that while the vaccine reduces transmission and viral RNA shedding, it does not fully prevent spread under intensive exposure conditions and that RNA shedding alone is an unreliable predictor of transmission reduction.