Which genus is commonly implicated in mucormycosis among diabetic patients?

Which genus is commonly implicated in mucormycosis among diabetic patients?

• A. Aspergillus
• B. Candida
• C. Rhizopus
• D. Histoplasma

Answer: (C)

Mucormycosis is caused by fungi in the Mucorales, and in diabetic patients the most frequent culprit is Rhizopus. Diabetes, especially when ketoacidosis is present, creates conditions that Rhizopus finds favorable—acidity and higher free iron promote its growth and enable rapid invasion of blood vessels. This angioinvasion leads to tissue necrosis and often presents clinically as rhinocerebral disease in diabetics, starting in the sinuses and potentially spreading to the orbit or brain. The fungal hyphae are broad, non-septate (or sparsely septate) and tend to branch at wide angles, a feature seen on microscopic examination. Culture typically shows rapid growth on standard fungal media. Other fungi like Aspergillus, Candida, or Histoplasma can cause invasive disease in different settings, but they are not the most common cause of mucormycosis in diabetics.

Mucormycosis is caused by fungi in the Mucorales, and in diabetic patients the most frequent culprit is Rhizopus. Diabetes, especially when ketoacidosis is present, creates conditions that Rhizopus finds favorable—acidity and higher free iron promote its growth and enable rapid invasion of blood vessels. This angioinvasion leads to tissue necrosis and often presents clinically as rhinocerebral disease in diabetics, starting in the sinuses and potentially spreading to the orbit or brain. The fungal hyphae are broad, non-septate (or sparsely septate) and tend to branch at wide angles, a feature seen on microscopic examination. Culture typically shows rapid growth on standard fungal media. Other fungi like Aspergillus, Candida, or Histoplasma can cause invasive disease in different settings, but they are not the most common cause of mucormycosis in diabetics.