The preparation of the stools was the same in these cases as that reported in a previous article.1
Anti-egg white rabbit serum of a titer of 40,000 was used. Titer equals highest dilution of egg white in salt solution in which the serum produced precipitate by contact method after one hour at room temperature.
The first group (Table 1) consisting of 103 stools from 24 cases showed three positive reactions. These stools were all from children two years or over. Two of the positive reactions occurred in the case of idiocy (Case 6). This child had a large quantity of egg in the diet since it was about the only food which she would take readily. To the other children egg was usually given in the form of ice cream and pudding only on Sunday afternoons, but occasionally during the week. The single other positive reaction that occurred in