Prevalence, Clinical Presentation Antifungal Susceptibility Profiles and Factors Associated with Chronic Pulmonary Aspergillosis among Pulmonary Tuberculosis Suspects in Uganda: A Cross- sectional study

In many parts of the world, a persistent cough, fever, and weight loss are often the first signs of a serious lung infection. For decades, doctors have focused heavily on tuberculosis, a contagious disease caused by bacteria that thrives in crowded conditions and remains a leading cause of death globally. However, the lungs are also vulnerable to a different kind of invader: mold. Specifically, a fungus called Aspergillus, which lives invisibly in the air we breathe, can take hold in lungs that have already been weakened by other illnesses. When this happens, it creates a condition known as chronic pulmonary aspergillosis. The trouble is that the symptoms of this fungal infection look almost exactly like tuberculosis. A patient might cough up blood, lose weight, and feel exhausted, leading a doctor to treat them for the wrong disease. This confusion is dangerous because the medicines used to kill bacteria do nothing to stop a fungus, and the delay allows the infection to worsen.

Researchers in Uganda recently set out to untangle this diagnostic knot. They worked at Mulago National Referral Hospital in Kampala, a major medical center serving a population where tuberculosis is common. The team focused on adults who came to the clinic with respiratory symptoms that made doctors suspect tuberculosis. Instead of stopping their investigation once they ruled out or confirmed tuberculosis, the researchers also looked for signs of the fungal infection. They collected sputum samples from 135 patients and tested them using advanced molecular tools to detect tuberculosis bacteria, while simultaneously culturing the samples on special media to see if any mold would grow. They also examined chest X-rays to look for specific patterns of damage in the lungs and tested the isolated fungi to see which medicines could stop them.

The study revealed that the overlap between these two diseases is significant and often overlooked. Among the 135 patients evaluated, about 13 percent were found to have the fungal infection. This group included people who had active tuberculosis alongside the fungus, as well as those who had the fungus but no tuberculosis at all. The most common types of mold found were Aspergillus fumigatus and Aspergillus niger. When the researchers looked at the patients' symptoms, they found that those with the fungal infection often suffered from chest pain and had been sick for a longer time than those with only tuberculosis. In fact, the longer a patient had been coughing and feeling unwell, the more likely they were to have the fungal infection. The chest X-rays of these patients frequently showed scarring or fibrosis in the lungs, a sign of long-term damage.

Perhaps most importantly, the study provided a clear picture of how to treat these patients. The researchers tested the isolated fungi against common antifungal drugs and found that all the samples were sensitive to a medication called voriconazole, meaning the drug would effectively stop the growth of the fungus. However, they also discovered that about 31 percent of the fungal samples were resistant to another drug, amphotericin B, suggesting that not all treatments work for every patient. The findings suggest that in regions where tuberculosis is common, doctors should consider screening for this fungal infection in patients who do not respond to standard tuberculosis treatment or who have symptoms that linger for weeks. By identifying the fungal cause early, clinicians can prescribe the right medication sooner, potentially preventing further lung damage and saving lives in a setting where misdiagnosis is a frequent and costly problem.