Fungal outgrowth in ants (IMAGE) Institute of Science and Technology Austria Caption The insects get sick when enough fungal spores infect them internally. Metarhizium is dependent on killing its host, so it can then grow out new spores that spread from the carcass. Credit Matthias Konrad/ISTA Usage Restrictions - License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.