| current status of marek's disease in the united states and worldwide based on a questionnaire survey. | a questionnaire was widely distributed in 2011 to estimate the global prevalence of marek's disease (md) and gain a better understanding of current control strategies and future concerns. a total of 112 questionnaires were returned representing 116 countries from sources including national branch secretaries of the world veterinary poultry association, vaccine, breeder, and production companies, as well as md researchers from various backgrounds. each country listed on a questionnaire was record ... | 2013 | 23901765 |