Immunological Protection Against Vaccine-Preventable Infections (Hepatitis B, Measles, Rubella, Mumps, Diphtheria, Tetanus) of Russian and Foreign Students: A Simultaneous Study

Abstract

The increase in the incidence of vaccine-preventable infections is due to the low level of immunological protection of the population, which against the background of active migration processes can determine high risks of outbreaks of infectious diseases and the development of epidemics. To study the tension of post-vaccination immunity to hepatitis B, measles, rubella, mumps, diphtheria, tetanus among Russian and foreign students studying in a Russian university. The study included students who received a full course of vaccination and revaccination for hepatitis B, tetanus, diphtheria, measles, rubella and mumps in accordance with the National Calendar of the Russian Federation (including students from Turkmenistan and Syria), similar immunization programs in Israel (students from Jordan and Palestine) and Tajikistan who did not have (according to medical records) these infections in the past. Evaluation of the state of immunity was carried out by determining antibodies by ELISA (hepatitis B virus and rubella), RPHA (tetanus and diphtheria toxoids) and RTGA (mumps and measles virus). The minimum protective level of antibodies was established when their concentration to HBsAg > 0.01 IU/ml, rubella virus > 10 IU/ml, titer to tetanus toxoid 1:20; diphtheria toxoid 1:40, mumps virus 1:10, measles 1: 4. 40 Russian and 63 foreign students were examined. The minimum protective level of antibodies and higher against tetanus and diphtheria toxoids has been established for all students, for hepatitis B — only for Russian students. The minimum protective level of antibodies to measles among Russian students was absent in 5 (13%), against mumps — 4 (10%), and rubella — 2 (5%) cases. Among foreign students, an insufficient level of antibodies to hepatitis B was recorded in 18 (29%), for measles — 19 (30%), for mumps — 15 (24%), for rubella — 4 (6%) cases. Insufficient protection of Russian and foreign students to measles, rubella and mumps was established, only foreign students to hepatitis B.