তিনি উল্লেখ করেন যে কিছু গবেষণায় দেখা গেছে বিশ্বজুড়ে মহামারী হওয়ার আগে অবশ্যই এই রোগটি কম প্রাণঘাতী আকার ধারণ করবে। The previous text is in Bengali. Here is a translation to Vietnamese:
Một số nghiên cứu gợi ý rằng căn bệnh hẳn là đã trở nên ít nguy hiểm hơn trước khi tạo nên một đại dịch toàn cầu, ông ghi nhận.