夏天，是痢疾、肝炎、伤寒、霍乱、细菌等肠道传染病的多发季节。这些病发病急、来势凶、传播快，对人体健康危害极大。为什么夏天容易发生肠道传染病呢 ?　　夏天气温高，空气湿度大，适合病原微生物的生长繁殖，大约在 20～ 30分钟左右就繁殖一代。如果食物被病原微生物污染 Summer, is dysentery, hepatitis, typhoid fever, cholera, bacteria and other infectious diseases of the season. Emergence of these diseases, the potential fierce, spread fast, great harm to human health. Why the summer prone to intestinal infectious diseases? Summer high temperature, air humidity, suitable for the growth and reproduction of pathogenic microorganisms, about 20 to 30 minutes on the breeding generation. If the food is contaminated by pathogenic microorganisms