Fight - HBs level falls should multiple cropping

Second liver vaccine is vaccinal the first time after 3 needles, the protection antibody of generation (fight - HBs) level falls along with the elapse year after year of time, should detect piece fight - HBs level under effective chroma when, must go again multiple cropping. Vaccine of liver of second of homebred blood source is normally vaccinal the first time after 3 needles, the person of about 40% above passes 3~4 year, its are fought - HBs level already fell to 10 international unit / litre the following, reason should be in commonly 3~4 undertakes multiple cropping after year. In addition, in have an inoculation after the 3rd needle, if exterior antibody drop is spent,detect unit of more than 1000 international / litre, general tenability 7~10 year, if be in only 10~100 international unit / litre between can maintain 3~5 only year effective protection time. (the exercitation edits: Plum apricot)