In most cases, histoplasmosis causes mild flu-like symptoms that appear between 3 and 17 days after exposure to the fungus. These symptoms include fever, chills, headache, muscle aches, cough and chest discomfort. In these milder forms, most symptoms go away on their own in a few weeks.
https://www.lung.org/lung-health-diseases/lung-disease-lookup/histoplasmosis/symptoms-diagnosis

