The Spanish influenza is said to have infected anywhere from a fifth to over one half of the world’s population at the time.
وَرُبَّمَا قَتَلَ ٱلْفِيرُوسُ مَا بَيْنَ ١ وَ ١٠ فِي ٱلْمِئَةِ مِنَ ٱلْمُصَابِينَ بِهِ .‏