A dangerous airborne fungus that has the potential to rot human tissue from the inside is spreading at a considerably increasing rate across the United States. It has prompted concerns among the medical professionals and public health authorities. Aspergillus fumigatus. This is said to be the culprit behind this surge and poses a risk to especially those whose immune system had been compromised. The cases are becoming harder to treat due to widespread drug resistance and climate-linked proliferation. The World Health Organization (WHO) has classified Aspergillus fumigatus as a “critical priority” due to its high mortality rate and growing resistance to existing treatments.Silent InvaderIt is called a silent invader for a reason. Once you inhale, the fungus can cause aspergillosis. This is a serious lung infection. The spores are microscopic, which mean hat people can breathe them in unknowingly. For patients who are already vulnerable medically, for instance, those battling cancer, asthma, HIV or recovering from organ transplants, the infection can lead to chronic lung disease, systemic organ failure, or even death. If invasive, it can also spread to your brain, hear, and kidneys.Despite its potentially fatal consequences, aspergillosis is not classified as a reportable disease in the United States. This means infections are not systematically tracked, leaving health officials with limited data and making it harder to trace or contain outbreaks.Infections On The RiseBetween 2000 to 2013, hospitalizations have increased in the case of invasive aspergillosis in the US. The rate is reported by a 3% increased, annually. In 2014, the infection led to 15,000 hospital stays, with a cost up to $1.2 billion. As the US News notes, postmortem examinations in intensive care units suggest that aspergillosis is among the top four infections most likely to be fatal.While about 400,000 Americans may be living with chronic pulmonary aspergillosis — the long-term form of the disease — invasive cases, though less frequent, are significantly deadlier. Survival rates drop sharply: just 59% of organ transplant patients and only 25% of stem cell transplant patients live beyond a year after infection.What Is Causing Its Spread?The fungus thrives in hot, damp, and humid environment. They can also endure up to 120 degree Fahrenheit. This is especially true in compost or agricultural waste. States like Florida, Texas, Georgia, Louisiana, and California — with their humid climates and farming activity — are seeing some of the highest exposure levels. Cities such as New York, Houston, and Los Angeles are also at risk due to overcrowding, aging buildings, and limited ventilation.According to a University of Manchester study, if fossil fuel use continues at current levels, Aspergillus fumigatus could expand its range by over 75% by 2100 — putting millions more at risk across the southern US.What is making it even more difficult to control is the increasing drug resistance. Azole drugs — commonly used to treat human fungal infections — are also applied to protect crops. This dual-use, experts say, may be fueling cross-environmental resistance, with drug-resistant spores jumping from soil to humans.A study published in Applied and Environmental Microbiology found resistant fungal strains in agricultural soil across at least seven US states. Some strains are resistant to multiple standard antifungals, making treatment increasingly difficult.WHO has also urged pharmaceutical companies to invest in new antifungals, including children in drug trials, and enhance diagnostic and treatment protocols globally.Preventive MeasuresAs of now, doctors recommend to avoid contact with soil, mold, and gardening. It is important to wear protective masks when in dusty areas, and ensure good air filtration at home.