How long after catching Covid can you become reinfected and when should you get your booster?

People may become reinfected with Covid-19 as early as 28 days after recovering from the virus, according to the latest advice from the Australian Health Protection Principal Committee. Previously, reinfection was defined as a case occurring more than 12 weeks after an initial infection. The committee said the Omicron subvariants BA.4 and BA.5 “are associated with increased immune escape and we are likely to see rates of reinfection rise among those who have previously been infected with an earlier Covid-19 variant, and those who are up to date with their vaccinations”.