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Table 5 Summary of studies on the reproduction number of the delta variant

From: The reproduction rate of severe acute respiratory syndrome coronavirus 2 different variants recently circulated in human: a narrative review

Study

Location

Study date

Method

Estimated R0

Other findings

Li et al.

Guangdong, China

May, 2021 to June, 2021

Calculating viral loads in the oropharyngeal swabs of quarantined individuals by days between exposure and the time of RT-PCR test

 

Viral loads: 1260-fold higher in delta variant infected patients in comparison to those of the wild-type strain

Liu et al.

  

Review study

Mean R value of delta variant = 5.08 (between 3.2 and 8)

Mean R0 of ancestral variant = 2.79

 

Tian et al.

  

Review study

R value of delta variant = 4.04–5.0

R0 of wild-type variants = 2.2–3.77

GT of the delta variant = 2.9

GT of the wild-type variants = 5.7