从１９８５年到１９９４年我县对的４５万人次进行接种观察，结果显示接种流脑多糖菌苗不仅打断了流脑流行环节，而且大大降低了流脑的发病率，现降至０．２１／１０万。１９８５年至今，每年只有１至２人患病，为未接种菌苗者，观察表明流脑多糖菌苗人群保护率为９８．６１％。 From 1985 to 1994, 450,000 people in our county were vaccinated. The results showed that inoculation of meningitis polysaccharide vaccine not only interrupted the epidemic of meningococcal meningitis, but also greatly reduced the incidence of meningitis to 0.21 / 100,000. Since 1985, only 1 to 2 people are sick each year. Those who have not inoculated with the vaccine have observed that the protection rate of the meningitis group is 98.61%.