Transmission of HP in 1 inoculated and 40 contact turkeys (HP 1+40).

Turkey 0 was inoculated with HP on day 0 as described in methods, and then co-housed with 20 naïve in-contact turkeys. Table symbols are as follows: +, positive buccal swab; –, negative buccal swab; x, bird died or killed; (+) buccal swab negative, but bird inferred to be shedding to make a logical infection history.