<p>Peak body for immunologists changes guidelines as evidence shows up to 90% of those reporting allergy don’t have one</p><ul><li><p>Get our <a href="https://www.theguardian.com/email-newsletters?CMP=cvau_sfl">breaking news email</a>, <a href="https://app.adjust.com/w4u7jx3">free app</a> or <a href="https://www.theguardian.com/australia-news/series/full-story?CMP=cvau_sfl">daily news podcast</a></p></li></ul><p>The majority of Australians who report a penicillin allergy are not truly allergic, prompting the peak body for immunologists to change its guidelines in a bid to reduce hospitals stays and tackle antimicrobial resistance.</p><p>Penicillin, one of the most commonly prescribed antibiotics in Australia, was thought to cause allergies in 10% of Australians, or about 2.8 million people.</p> <a href="https://www.theguardian.com/australia-news/2026/oct/22/penicillin-allergy-australia-doctors-antibiotic-guidelines">Continue reading...</a>