Mixta calida, previously known as Pantoea calida, was initially isolated from powdered infant milk in 2010. It falls within the Erwiniaceae family (class: Enterobacterales). While Mixta calida was traditionally regarded as non-pathogenic, we now present a case of Mixta calida bacteraemia and meningitis in a 5-week-old child, successfully treated with cefotaxime. This case, in contrast to prior reports with potential contamination issues, is the first to offer compelling evidence of Mixta calida's pathogenicity in humans.
Keywords: Mixta calida meningitis; bacteremia; pathogenicity.