the short answer is that, you do not need to get the vaccine because you have some immunity against COVID-19 for at least 4 months (maybe for 2-3 years).. the long answer starts by knowing that you acquire immunity by 3 ways: by getting the illness and surviving it.. by vaccination.. and soon after being born (for babies).. you have already got COVID-19 and had survived it, so you are immune, and you really do not need a COVID-19 vaccine UNLESS you ONLY suspect that you had COVID-19 and that you never really tested positive for COVID-19..
again if you did recover from COVID-19, you are immune and you do not need the vaccine for about 137 days (4 1/2 months) and this is how long antibodies against COVID-19 (aka SARS-CoV-2) last on average.. what vaccines do is they give the COVID-19 illness but with much much much milder and limited symptoms.. once you have recovered from COVID-19 or you have received a COVID-19 vaccine, your body produces antibodies to fight off the next infection of COVID-19 for at least 137 days on average.. but that's not the whole story..
after recovering from COVID-19 or after receiving a COVID-19 vaccine, a group of immune cells go into hibernation ready to fight the next infection of COVID-19.. turning a COVID-19 into a much milder illness and a much shorter-lived illness (maybe for few hours instead of days and weeks of the illness).. these immune cells are called Memory T cells and Memory B cells -- they are kinda hardened experienced soldiers put in reserve for the next fight.. the Memory T cells can sound the alarm much much sooner in the next infection of COVID-19, and the Memory B cells are ready to transform into large Plasma Cells (large antibody factories) much much sooner than getting COVID-19 for the first time..
we know that antibodies against COVID-19 (against SARS-CoV-2) last around 137 days (4 1/2 months) but we do not know how long that those Memory B&T cells immunity last.. however from our previous coronavirus epidemic SARS (the original SARS-CoV) that used to terrorize parts of Asia in 2003 to 2015, the cellular immunity last around 2-3 years on average..
ideally, we would recommend that you would get a booster shot around 5 month (because the pandemic is still raging everywhere).. HOWEVER, due to the global shortage of COVID-19 vaccines, the current priority is shifted to those who do not have any immunity against COVID-19 and who never had COVID-19.. you still have the antibody protection that should cover you for about 4 months, and you still have the cellular immunity that should cover you for at least a year.. i would ask you to give your chance to other people who are in more danger to get the illness or die from the illness..
having said that.. being a COVID-19 survivor or being vaccinated against COVID-19 does NOT give you 100% protection against the next COVID-19 infection.. you will still need to wear a mask, observe social distancing, wash your hands frequently and all that jazz.. you should know that few people got COVID-19 after they were vaccinated (11 in Moderna trials and 8 under the Pfizer trial) and at least 3 people worldwide who got COVID-19 TWICE!!
the way we explain this to people is that when you go to war, you will need to wear/bring a helmet, a bullet-proof vest, a machine gun and a side gun, some eye protection and maybe the use of satellite images, spy-drones and spy-planes.. you will need all that to improve your chances of not getting injured or killed during battle..
so think of a COVID19 vaccine/immunity as a bullet proof vest, and a mask as a helmet, social distancing as main weapon and washing hands as your side arm.. also think of isolations, quarantine and lockdowns as satellites, spy planes and drones.. you will need ALL that in a war to increase your chances for not getting COVID-19..`
only when the war has ended and only when there is no danger in sight, we can take off the helmet, put away the weapon and such.. only when less and less people get COVID-19 at any given community, we can put down the mask, bring people to social events and allow free travel all over the world - like we used to.. `
and all the best[ added.. nowadays, people are talking about variants or strains (mutations produce variants, and significant variants are given the title strain), there was a study in S. Africa when an alarming number of COVID-19 survivors got re-infected with COVID-19 within 6 months as if they were getting COVID-19 for the first time.. a similar unfinished study in the UK also suggest this outcome.. at the moment, most vaccine manufacturers claim that their vaccine were tested and they have proven to work against COVID-19 variants: the UK variant (aka. the Kent variant which is now dominant variant in the US), the South African variant and the Brazilian variant, that significantly different from the Wild variant (the original COVID-19).. we yet to know more details on that aspect.. ]