Show me the paragraph saying so.
The results show that infections occurring 12 d or longer after vaccination have significantly reduced viral loads at the time of testing, potentially affecting viral shedding and contagiousness as well as the severity of the disease13. This report is based on an
Clearly you can't read or lack comprehension skills. 12 days is nearly as long as the period people need to isolate for if they may have it. It takes that long to find out.
The whole problem all along is that people can infect others before they know they have it and of course asymptomatic.