India, June 16 -- A deadly fungus that can rot human tissue is spreading fast across the US, and experts say it could get worse as the weather gets hotter. The fungus is called Aspergillus fumigatus. It spreads through the air and is almost impossible to avoid. The spores are so small that people breathe them in without knowing.

This fungus can cause a lung infection called aspergillosis. For people with weak immune systems, this can lead to organ failure and even death. People with cancer, asthma, or HIV are at higher risk.

Scientists say the fungus is spreading in parts of the US, especially in warm, wet states like Florida, Louisiana, Texas, Georgia, and California. Cities like New York, Houston, and Los Angeles are also at risk beca...