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近20年的观察表明,普通霍乱菌苗对人仅有中等或低度的保护力;接种菌苗后所获得的保护作用一般仅能维持4～6个月;罹患霍乱时,不因免疫而改善临床症状;在流行
Nearly 20 years of observations have shown that ordinary cholera vaccine has only moderate or low protection to humans; the protective effect obtained after vaccination is generally only 4-6 months; when cholera is not immune to Improve clinical symptoms; prevalence