Pneumococcal infection remains a significant global health problem. and vaccination is the main measure for its prevention. To date. the period of use of pneumococcal conjugated polysaccharide vaccines in Russia exceeds 14 years. https://kedmmsjqg4be.timeblog.net/70683137/effects-of-timing-and-nitrogen-fertilizer-application-rates-on-maize-yield-components-and-yield-in-eastern-ethiopia