There’s no evidence COVID-19 booster shots are needed yet in Australia, an infectious diseases expert says. This comes after the Czech Republic announced this week it would offer booster shots to anyone vaccinated at least eight months earlier, joining a growing list of countries stepping up measures to curb the spread of the Delta variant. Media reports out of Israel suggest the more infectious Delta strain is leading to cases of re-infection, but it is unclear whether this is the result of waning antibodies from vaccinations that began in that country in December 2020. Australian National University’s Professor Peter Collignon said he was aware of the situation in Israel, but it was still unclear how antibody levels dropped over time. And further work is needed on how waning immunity could affect protection against hospitalisation and death. “The evidence is not there that we need (boosters) yet,” he told AAP on …