Serological Monitoring of Herd Immunity to Measles in Indicator Groups and Groups of Risk

The analysis of herd immunity to measles in the Republic of Tatarstan indicates epidemiological well-being, with the values correlating with average values across the Russian Federation (RF) in the following indicator groups: 3–4 and 9–10 years of age. The proportion of antibody-negative individuals increases (in comparison with the average values across the RF) in the age groups of 16–17 and 23–28 years and older than 30 years that suggest the tendency to epidemiological unsafety in these age categories. High titers of anti-measles antibodies in the age groups older than 40 years might evidence about definitely increased post-infection immunity.