Abstract

An issue of eradicating measles and rubella virus-induced infections currently remains unresolved, despite existing effective methods for specific prophylaxis and WHO’s commitment to a mass vaccination policy. While improving epidemic situation, analysis of new challenges, such as measles incidence in adults, especially in adults vaccinated in childhood, is of particular interest. The aim of the study was to analyze serum measles and rubella virus-specific IgG antibodies in young healthy people and estimate antigen-specific cellular immune response in seronegative subjects. There were examined 100 healthy adults aged 18–30 years old. Level of serum specific IgG was measured by ELISA (Vector-Best, Russia). Antigen-specific cellular immune response was assessed by magnitude of surface CD107a expression on CD8hi T cells challenged by measles and rubella virus-derived antigens. It was found that average level of antibodies against rubella virus comprised 175.5 IU/ml, 49% of which recovered after rubella, 46% were vaccinated, whereas 5% subjects contained no virus-specific antibodies. In addition, mean level of anti-measles virus antibodies was below protective magnitude, among which 1% subjects recovered after measles, 31% displayed post-vaccination immunity, 55% subjects were seronegative, and 13% had equivocal levels of specific antibodies. Thus, 68% subjects were unprotected against measles virus based on the level of serum virus-specific antibodies. Moreover, 40 out of 68 subjects were vaccinated against measles in childhood. Additional screening adult subjects for intensity of measles and rubella virus-specific cellular immunity demonstrated that 57.37% of them contained peripheral blood CD8 T cells against measles virus and 59.01% — against rubella virus. Further analysis allowed to identify 4 subgroups displaying: 1) high level of virus-specific antibodies and T cells; 2) neither antibodies nor specific T-cells reaching as low as 20% of baseline group; 3) high antibody level combined with low amount of specific T cells; and 4) low antibody level combined with high level of specific T cells. thus, it may be assumed that cellular and humoral immune arms are maintained independently and being active for a long term after vaccination. Preserving a specific T-cell immunity seems to provide protection against infection, thereby accounting for the lack of measles manifestation in all seronegative subjects.

Highlights

  • Были обследованы 100 здоровых индивидуумов в возрасте от 18 до 30 лет

  • especially in adults vaccinated in childhood

  • analyze serum measles and rubella virus-specific IgG antibodies in young healthy people

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Summary

Краткие сообщения

ГУМОРАЛЬНЫЙ И КЛЕТОЧНЫЙ ИММУНИТЕТ К АНТИГЕНАМ ВИРУСОВ КОРИ И КРАСНУХИ У ЗДОРОВЫХ ЛЮДЕЙ. Специфический клеточный иммунитет оценивали по экспрессии CD107a на CD8hi-лимфоцитах в ответ на антигены вирусов кори и краснухи. Обнаружено, что средний уровень антител против вируса краснухи составляет 175,5 МЕ/мл, при этом 49% обследованных переболели краснухой, 46% были привиты и 5% не имели специфических антител. Средний уровень антител против вируса кори оказался ниже защитного уровня, при этом 1% обследованных перенес корь, 31% имел поствакцинальный иммунитет, 55% были серонегативные, а 13% имели сомнительный уровень специфических антител («серая зона»). Эти 68 здоровых взрослых дополнительно обследованы на наличие специфического клеточного иммунитета к вирусу кори и краснухи. Библиографическое описание: Смердова М.А., Топтыгина А.П., Андреев Ю.Ю., Сенникова С.В., Зеткин А.Ю., Клыкова Т.Г., Беляков С.И. Гуморальный и клеточный иммунитет к антигенам вирусов кори и краснухи у здоровых людей // Инфекция и иммунитет.

Инфекция и иммунитет
Материалы и методы
Findings
Результаты и обсуждение
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