title: [Effect of population immunity against hepatitis A in day-care centers].
abstract: The authors investigated 21 groups with hepatitis A (HA) introduction into 16 day-care centers in a district of Xi'an, studied the infection condition and the effect of population immunity against HA on the HA transmission. The results showed that when the level of population immunity prior to HA introduction was below 50 percent, population immunity played no significant role in the HA transmission.
authors.affiliation: Department of Epidemiology, Fourth Military Medical University, Xi'an.
authors.forename: J H
authors.initials: JH
authors.lastname: Fan
mesh_terms: D002656:Child Day Care Centers; D002675:Child, Preschool; D005260:Female; D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies / Q000097:blood*; D006507:Hepatovirus / Q000276:immunology*; D006801:Humans; D007075:Immunoglobulin M / Q000097:blood*; D008297:Male
chemical_list: D035922:Hepatitis A Antibodies; D006508:Hepatitis Antibodies; D007075:Immunoglobulin M