We believe that this might be possible i.e. someone might have had a proper course of the vaccine and be protected themselves, but still might be able to transmit the infection to someone else. This is because the inside of the body is protected against an infection but the infection might still be able to survive in the upper airways. However, a person who does not have symptoms is also not coughing and sneezing which very much reduces the possibility of transmission. More information about this aspect will come out when the scientists have had more time to study the effects of vaccinations of large numbers of people. The best thing to do to protect the community is to take the vaccine.
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