American consumer misconceptions about Bovine Spongiform Encephalopathy (BSE), or mad cow disease, and foot- and-mouth disease (FMD) may be beginning to impact purchase of beef and other animal products, according to a survey just released by Porter Novelli. A small percentage of those surveyed (14 percent) said they already have changed their food purchase or eating habits based on reports they had recently seen or heard regarding BSE and FMD.