It usually takes a few weeks for the body to develop immunity after vaccination. This means that it is possible for a person to become infected with a virus that causes COVID-19 just before or after vaccination and becomes ill because there is not enough time to protect the vaccine. Vaccines currently in clinical trials in the united states do not allow you to test positive for viral tests.
According to various studies, the immunity kicks in only after two to four weeks after second dose of the vaccine is administered. And this is especially an issue for vaccines such as AstraZeneca, which has 12 to 16 weeks interval between the doses. But that doesn't mean that there will be no impact before this time. As per the researchers, there will be some immunity immediately after the first dose. And this will improve as time passes. Even one dose of the vaccine will be able to prevent the infections 80% of the time.
when our bodies are entered by vaccines, it is as if there is a new army tasked with preventing the corona virus from attacking our bodies, and with these troops, recognizing the virus will be faster, it doesn't take up to 2 weeks, like the way the immune works naturally . Hopefully, with the faster distribution of this vaccine, it will be able to reduce the room for the virus to grow