Researchers in Japan discovered that a dangerous fungus called Aspergillus latus, previously unknown in the country, has been causing infections since at least 2013. This fungus is difficult to identify because it looks similar to other related species and is actually a hybrid created from two different Aspergillus species. The study found seven cases of this fungus in clinical samples and discovered that it is resistant to some common antifungal medications, making accurate identification crucial for proper patient treatment.