Table 2.

Estimated quanta-RNA relationship for various strains of SARS-CoV-2.

Strain of SARS-CoV-2	Infectivity compared to variant in the previous row	${\mathit{c}}_{\mathit{i}}\left(\frac{quanta}{RNA}\right)$	Virus variant quanta multiplier (−)
Original (Wuhan)	–	14000	1.0
Alpha (B.1.1.7)	+90% [54]	7400	1.9
Delta (B 1.617.2)	+150% [55]	5000	2.8
Omicron (B.1.1.529)	+420% [56]	1200	11.7