The main purpose of vaccines is to fight pathogens and strengthen the body's immunity. Based on this, many people who have been infected with Covid and have recovered may think that their vaccination is unnecessary, as long as the body has previously fought the virus - so it has immunity.
"So far, vaccine trials have focused on people who have not been exposed to the coronavirus, so the effect of vaccination on people who have been exposed before is unclear," Prof. Robin Shattock of Imperial College London. "However, since immunity to the virus appears to weaken over time, vaccination is worthwhile."
He went on to say: "The level of immunity from a natural infection is really variable, so some people have a very strong immune response, while some others have a weaker response. The vaccine will complement your immune response and we hope to provide the longest possible protection. ”
Even after being vaccinated, it is possible for some people to require additional booster doses to maintain strong immunity.
In late October, studies conducted in the UK revealed that antibody levels in people who had passed the coronavirus fell by 27% over the three-month period during the summer, adding to fears of "short-lived" immunity. However, experts said that these studies do not have to be worrying as the situation is more than normal.
Levels of antibodies created in the body to protect the immune system against coronavirus fall as the body clears a certain infection. However immune cells carry a memory of the virus and can produce new antibodies when needed.
