In accident of food toxin, people are not harmed by food but by microorganisms growing in food or on the surface of the food. The eggs laid by hens may contain enteritis bacillus, which can cause people infect with salmonellosis with major characters of nausea, omitting and serious diarrhea.

Eggs laid by hens infected with enteritis bacillus may contain enteritis bacillus even if the egg hells look intact. Recently, the American scientists have developed an oil type emulsion vaccine by using a kind of inactivated enteritis bacillus, which can provide good protection of hens infected with enteritis bacillus. Different from the commercial vaccine, the formula of this vaccine can improve the specific antibody level of enteritis bacillus entering the gut, so it can reduce the number of enteritis bacillus and finally realized the possibility of the number of enteritis bacillus entering internal organs and entering faces. The vaccine developed by American scientists can be used for 2 times by subcutaneous injection, with an interval of 4-6 weeks. The result of the experiment shows that the efficiency of killing enteritis bacillus in chicken’s body is 10%~40% higher than the 3 kinds of vaccines currently used in the United States.