Delta variant’s transmission in vaccinated and unvaccinated individuals

… highly transmissible and spreading globally, including in populations with high vaccination rates

… Household and non-household exposed contacts aged 5 years or older

… analysed transmission risk by vaccination status

… fully vaccinated index cases was similar to household contacts exposed to unvaccinated index cases (25% … for vaccinated vs 23% … for unvaccinated)

… confirmed by genomic and virological analysis

… peak viral load did not differ by vaccination status or variant type

… fully vaccinated … can efficiently transmit infection in household settings, including to fully vaccinated contacts