Delta now 'dominant' COVID-19 strain in Saskatoon sewage samples, researchers say

The Delta variant is spreading about 55% faster than the alpha strain that was first identified in the United Kingdom late last year, according to the World Health Organization (WHO) -- and that strain spreads about 50% faster than the version that first began infecting people in late 2019. (Mario Tama/Getty Images) The Delta variant is spreading about 55% faster than the alpha strain that was first identified in the United Kingdom late last year, according to the World Health Organization (WHO) -- and that strain spreads about 50% faster than the version that first began infecting people in late 2019. (Mario Tama/Getty Images)