A study on the spread of COVID-19 found that vaccination is an important tool in decreasing the spread of the virus. Please see the below extracts from the studies, titled “COVID-19 vaccines and decreased transmission of SARS-CoV-2”; and “Prevention of host-to-host transmission by SARS-CoV-2 vaccines”:
“Current clinical evidence shows that COVID-19 vaccination protects against severe symptoms of the disease but is also an important tool to decrease the spread of the virus and the rate of infection. At this point in time, the global COVID-19 pandemic is complex, some countries have vaccinated a large portion of their population, others have difficulty accessing vaccination, and there is a wide variety of measures put in place and closures between the countries. These discrepancies may bring out variants of the virus and prolong the global pandemic phase. Vaccinated individuals are likely to be less likely to transmit the virus; however, it remains critical to continue to maintain responsible behaviors.” (Vitiello et al., Inflammopharmacology 2021)
(Source: COVID-19 vaccines and decreased transmission of SARS-CoV-2)
“As vaccine uptake increases globally, we are beginning to see suppression of person-to-person SARS-CoV-2 transmission. By leveraging various arms of the adaptive immune response in both mucosal and systemic environments, several of the available vaccines appear to limit infection and viral replication, often lowering viral load beneath the threshold for transmission and preventing symptoms. Although many studies show significant efficacy in preventing transmission for some vaccines, such as the Pfizer-BioNTech, Moderna, and Johnson & Johnson vaccines, scant data exist for other approved vaccines, such as the Sinopharm vaccine and Sputnik V (Mostaghimi et al., Lancet Infect Dis 2021)
(Source: Prevention of host-to-host transmission by SARS-CoV-2 vaccines )