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【134】中国産か日本産かをPCRで判別できるのか - 大橋眞
中国産の野菜や食品が、スーパーに並んでいます。日本産か中国産かを消費者がを判別する手段として、貼ってあるラベルの情報があります。もし、このラベルがなかったら、日本産か中国産かを見分ける方法はあるでしょうか。食品の場合は、目に見えるので、慣れた人ならわかるかもしれません。しかし、その判断は、前もって各産地の特徴を知っているからです。前もって知っている情報をもとにして、どちらに近いかを判別できるわけです。
ウイルスの産地を判別する方法はあるでしょうか。ウイルスには、ラベルがないので、PCRで遺伝子を調べます。しかし遺伝子を調べて産地を知るには、中国産のウイルスと日本産のウイルスの特徴に関するデータが必要です。いわゆる遺伝子情報です。基礎調査は、このようなウイルスの特徴と地域分布の関係を明らかにするために行います。今回の件に関しては、PCR検査で陽性になるウイルスの地域分布が基礎調査で必要です。この地域調査の結果、すでにその地域においてPCR陽性になるウイルスが分布しているようなら、このPCR検査は新たに入ってきたウイルスであるとは言えないわけです。この基礎調査がない状態では、PCR陽性の人が出たとしても、中国から来た危険なウイルスを持っているとは言えないのです。
Vegetables and foods from China are lined up in supermarkets. There is information on the label attached as a means for consumers to distinguish between Japanese and Chinese products. If it weren't for this label, would there be a way to tell if it was made in Japan or China? In the case of food, it is visible and may be obvious to those who are accustomed to it. However, the decision is because we know the characteristics of each production area in advance. Based on the information you know in advance, you can determine which is closer.
Is there a way to determine the origin of the virus? The virus has no label, so the gene is examined by PCR. However, in order to examine the genes and know the place of origin, we need data on the characteristics of Chinese and Japanese viruses. This is so-called genetic information. Basic research is conducted to clarify the relationship between the characteristics of such viruses and their regional distribution. In this case, the basic survey requires a regional distribution of viruses that test positive for PCR. If, as a result of this area survey, a virus that is PCR-positive is already distributed in that area, it cannot be said that this PCR test is a new virus. Without this basic survey, even if some people are PCR positive, they cannot say that they have a dangerous virus from China.
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