Frequency of adverse events up to 21 days after immunization;Frequency of adverse events up to seven days after immunization;The proportion of volunteers with increased levels of the immune response of specific neutralizing antibody titers in ELISA following the vaccination, compared with a placebo

Frequency of adverse events up to 21 days after immunization;Frequency of adverse events up to seven days after immunization;The proportion of volunteers with increased levels of the immune response of specific neutralizing antibody titers in ELISA following the vaccination, compared with a placebo