Omicron variant (B.1.1.529) of SARS-CoV-2: Mutation, infectivity, transmission, and vaccine resistance

Table 1 Comparison of the characteristics of the Omicron with the Delta

Characteristic	Omicron (B.1.1.529)	Delta (B.1.617.2)
Country first found	South Africa	India
Time first reported	November 24, 2021	December 5, 2020
Mutation residues	43	18
Δ69-70S deletion	+	-
Transmissibility	3-6 fold	1 fold
R in Gauteng SA	> 2	< 1
Morbidity	Mild	Severe
Death	Rare	Common
Age of patients	Middle aged people	Children or elderly
Vaccine effect	33%	80%

SA: South Africa.