We need to translate visible text content, preserving HTML tags exactly. Also keep meta charset tags etc. Must not add anything else. So output same HTML with Japanese translation. We need to translate each text node. Let's go through.

Mad cow disease started spreading among British herds ... spread it?

Translate to Japanese. "Mad cow disease started spreading among British herds in the mid-1970s. The disease began to peak in 1993 with about 1,000 cases a week. By 1996, variant Creutzfeldt-Jakob Disease or vCJD was detected in humans and was linked to the epidemic. But did you know that a virus or bacteria didn’t spread it?" Japanese: "狂牛病は1970年代半ばにイギリスの群れで広がり始めました。この病気は1993年にピークに達し、週に約1,000件の症例が出ました。1996年までに変異型クロイツフェルト・ヤコブ病（vCJD）が人間で検出され、流行と関連付けられました。しかし、ウイルスや細菌がそれを広