インド変異株、短時間で感染リスク　スパコン「富岳」で分析―理研など

　理化学研究所などは２４日までに、スーパーコンピューター「富岳」（神戸市）で新型コロナウイルスの感染リスクなどを分析した結果、インド由来の変異株では、会話で感染する可能性が高まるまでの時間が従来株の半分以下になると推定されたと発表した。
　理研チームリーダーの坪倉誠・神戸大教授は「変異株は距離だけでなく、時間にも注意が必要」と呼び掛けた。
　研究チームは、感染者がマスクを付けずに話した場合に飛沫（ひまつ）が飛び散る様子をシミュレーション。２メートル離れて立つ人が飛沫に含まれるウイルスを吸い込む量を推定し、従来株とインド株で感染するリスクを計算した。（2021/06/24-06:22）

A simulation by Japanese supercomputer Fugaku has shown that the Delta coronavirus variant, first identified in India, is likely to transmit through conversation droplets far faster than the original strain.
   A team led by researchers at Japanese government-linked research institute Riken found that the time that the Delta variant takes to present high infection risks during conversation is about half the amount the original strain needs.
   "As for the variant, we need to pay attention to the time, not just the distance," when having conversations, said Riken researcher Makoto Tsubokura, professor at Kobe University.
   The team simulated how droplets spread from an infected person talking without a mask and estimated how much virus in droplets is inhaled by a person standing 2 meters away, both for the Delta and original strains.
   Assuming that the variant is 2.5 times as contagious as the original strain, the possibility of getting infected reached 10 pct in some 45 minutes for the original strain and less than 20 minutes for the variant, according to the simulation.