Kalifornien. Ingen skillnad i viral load med deltavarianten oavsett vaccinstatus, symptom, ålder, kön eller val av vaccin.
Man är alltså lika smittsam oavsett om man är vaccinerad eller inte. Det spelar inte heller någon roll om vaccinet gör så att du får mindre symptom. Symptombilden har ingen koppling till hur smittsam du är.
Ungefär 1 på 15 av de vaccinerade (som testade positivt) hade mycket höga nivåer av virus trots att de var helt symptomfria.
Studien inkluderade bara helt ovaccinerade, eller fullvaccinerade >14 dagar efter sista dosen.
https://www.medrxiv.org/content/10.1101/2021.09.28.21264262v1
In our study, mean viral loads ... were similar for large numbers of asymptomatic and symptomatic individuals infected with SARS-Cov-2 during the Delta surge, regardless of vaccine status, age, or gender.
...
A substantial proportion of asymptomatic, fully vaccinated individuals in our study had low Ct values, indicative of high viral loads. Given that low Ct-values are indicative of high levels of virus, culture positivity, and increased transmission [11], our detection of low Ct-values in asymptomatic, fully vaccinated individuals is consistent with the potential for transmission from breakthrough infections prior to any emergence of symptoms.
...
Over 20% of positive, vaccinated individuals had low Ct-values (<20), a third of which were asymptomatic when tested. This highlights the need for additional studies of the immunological status of such vaccine escapes and how infectious they are. If such individuals carry high loads of active virus, asymptomatic vaccinated individuals may increasingly contribute to the ongoing pandemic as the proportion of vaccinated individuals grows.