We have at least 3 new dangerous variants of Sars Cov 2 viruses (Covid 19) so far:
- UK variant, identified as B.1.1.7
- South Africa variant, called as 20H/501Y.V2 or B.1.351
- Brazil variant, known as P.2
As reported by BBC News (February 9, 2021), the scary facts that South Africa halted the employing of UK’s AstraZeneca – Oxford vaccine, because the vaccine didn’t effective against new virus variant (20H/501Y.V2 or B.1.351).
I have posted about AstraZeneca – Oxford vaccine compared to other two American vaccines, Pfizer – Biontech and Moderna vaccines. Please find at:
- Is AstraZeneca Covid 19 Vaccine Suitable for Poor Countries? - Virus 31
The good news that another American vaccine, Johnson & Johnson has “good” efficacy to contain South Africa variant with one shot only, after proved by clinical trials.
Effective rate of Johnson & Johnson single shot vaccine in 3 important places (regions):
- 72% in the USA.
- 66% in Latin America, include Brazil
- 57% in South Africa
Hence, a Johnson & Johnson single shot vaccine is “estimated” able to give protection against Covid 19 virus and its new variants.