"That's quite a significant difference", said Dr. Eric Arts, a professor in Western University's department of microbiology and immunology.
According to Matt Hancock, Health and Social Care Secretary, both the vaccine doses are important as soon as they are available to get maximum protection against all existing variants and the ones that are in the level of mutation.More news: Vietnam to receive a million Covid vaccine doses by July
The Delta variant has been rapidly expanding throughout Canada.
It now accounts for about 90% of Covid cases in the UK.
Data from Public Health England (PHE), showed that two doses of the vaccine are 92% effective in preventing hospitalisations caused by the Delta variant, noting no deaths from the strain were reported among those who have completed their rounds.
Milwaukee's Commissioner of Health, Kirsten Johnson, reported two cases of the Delta variant were detected in Milwaukee County at the end of May.More news: Biden urges G-7 leaders to call out, compete with China
The variant has also threatened to delay reopening plans in the country and much of the world.
The data also suggests that the risk of hospitalization among those infected with the Delta variant was double that of the Alpha variant, especially in respondents with five or more severe medical comorbidities. "Yes, that could be the variant that's causing it, but it may just be also related to their age".
Dr. Gerald Evans, chair of infectious diseases at Queen's University, said there could be a variety of reasons for this.
The UK health secretary Matt Hancock revealed that the Delta variant is nearly twice more transmissible than the Alpha variant according to studies conducted in the country. "One dose isn't enough".More news: Alberta terminates involvement with Keystone XL project
Another analysis of Delta variant was done in Scotland and published covered a period between April 6 and June 6.