वियतनाम में 7 वैरिएंट मिल चुके हैं; एक हफ्ते में 61% केस और मौतें 20 फीसदी तक बढ़ीं
source https://www.bhaskar.com/international/news/a-new-variant-found-in-the-air-spread-in-30-areas-of-vietnam-in-the-countries-that-survived-the-epidemic-the-new-variant-raised-concern-128544228.html
source https://www.bhaskar.com/international/news/a-new-variant-found-in-the-air-spread-in-30-areas-of-vietnam-in-the-countries-that-survived-the-epidemic-the-new-variant-raised-concern-128544228.html