Types of fungal infections
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Overview of Fungal Infection Types
Fungal infections, also known as mycoses, can affect humans, animals, and even plants. These infections range from mild, superficial conditions to severe, life-threatening diseases, especially in people with weakened immune systems. The types of fungal infections are generally categorized based on the depth and location of infection, as well as the specific fungi involved Pathakumari2020Sun2020.
Superficial and Cutaneous Fungal Infections
Superficial fungal infections affect the outermost layers of the skin, hair, and nails. Dermatophytes are the most common cause, utilizing keratin as a nutrient source. These infections are usually mild and include conditions like athlete’s foot, ringworm, and nail fungus. Dermatophytes are classified as geophilic (soil-loving), zoophilic (animal-loving), or anthropophilic (human-loving), and infections can be more severe when the fungus infects a host it is not adapted to Seyedmousavi2018Jacobsen2019.
Subcutaneous Fungal Infections
Subcutaneous infections occur when fungi enter the body through cuts or punctures in the skin, leading to localized infections beneath the skin. These are less common and often result from environmental exposure, especially in tropical and subtropical regions. Examples include sporotrichosis and mycetoma .
Systemic and Invasive Fungal Infections
Systemic or invasive fungal infections are the most serious and occur when fungi spread throughout the body, often affecting internal organs. These infections are particularly dangerous for immunocompromised individuals, such as those with HIV, cancer, or organ transplants. The most common invasive fungal infections are caused by Candida, Aspergillus, and Cryptococcus species, with others like Mucoromycotina and Fusarium also posing risks Lockhart2019Lass‐Flörl2023Rayens2022+2 MORE.
Opportunistic Fungal Infections
Opportunistic mycoses occur mainly in people with weakened immune systems. Common examples include:
- Candidiasis: Caused by Candida species, affecting the mouth, throat, bloodstream, and internal organs.
- Aspergillosis: Caused by Aspergillus species, primarily affecting the lungs but can disseminate.
- Cryptococcosis: Caused by Cryptococcus species, often leading to meningitis in immunocompromised patients.
- Mucormycosis: Caused by Mucoromycotina, a rare but severe infection Lass‐Flörl2023Rayens2022Jacobsen2019+1 MORE.
Emerging and Reemerging Fungal Infections
New fungal threats are emerging, such as Candida auris, which has caused healthcare-associated outbreaks worldwide. Other fungi like Histoplasma capsulatum and Fusarium species are reemerging, especially among immunocompromised populations .
Zoonotic and Environmental Fungal Infections
Some fungal infections can be transmitted from animals to humans (zoonotic), such as Microsporum canis and Sporothrix brasiliensis. Environmental fungi, like those causing aspergillosis and mucormycosis, are found in soil and decaying organic matter and can infect both animals and humans Seyedmousavi2018Jacobsen2019.
Fungal Infections in Animals
Animals can suffer from a similar range of fungal infections, from superficial to fatal disseminated diseases. Notable examples include chytridiomycosis in amphibians and white-nose syndrome in bats. Mycotoxicoses, caused by toxic fungal metabolites, also pose risks to both animal and human health .
Conclusion
Fungal infections are diverse, ranging from mild superficial conditions to severe, invasive diseases. The most common types include superficial, subcutaneous, and systemic infections, with opportunistic and emerging pathogens posing significant threats, especially to immunocompromised individuals. Increased awareness, improved diagnostics, and better treatment strategies are essential to manage the growing burden of fungal diseases worldwide Lockhart2019Lass‐Flörl2023Rayens2022+4 MORE.
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