简述正向间接血凝试验的注意事项？
参考答案：
⑴试剂使用前必须恢复室温。
⑵诊断抗原用时须混匀。
⑶严重溶血或严重污染的血清样品不宜检测，以免发生非特异性反应。
⑷用不同批次的血凝抗原检测同一份血清时，应事先用阳性血清准确测定各批次血凝抗原的效价，取抗原效价相同或相近的血凝抗原检测待检血清抗体水平的结果是基本一致的。
⑸收到本试剂盒时，应立即打开包装，取出血凝抗原瓶，用力摇动，使粘附在瓶盖上的红细胞摇下，否则易出现沉渣，影响使用效果。
As we know, weather and climate can affect people in a number of ways. Farming and climate Farming is directly linked (联系) to weather and climate. For example, wheat needs dry, warm and sunny weather to grow while rice needs wet, hot and rainy weather. Farmers have to decide what to grow according to the weather in their area. When there is a sudden change in the climate, it will affect farming and food production around the world. Climate and people’s health A change in weather will also cause changes in food, air and water qualities. So it will have a deep effect on people in the future. Changes in weather and climate can cause infectious (传染的) illnesses to spread among people because germs (细菌) can be easily spread through air and water. Climate and water resources A climate change would influence the water system across the world. For example, in North America there is so much rain that towns and cities are often flooded. However, in North Africa, people can die of thirst because of being short of water. In recent years, as a result of global warming (全球变暖), we suffer a lot from extreme (极端的) weather each year and it is the duty of the whole world to control the climate change and save our own planet – the earth.
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