HAS4913
L6 : Common Infections (III)
Fungal Infections :
-Superficial Mycoses
-Opportunistic Mycoses
1
FUNGAL INFECTIONS
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Superficial (cutaneous) Mycoses
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Systemic (subcutaneous and internal organs) Mycoses
2
Superficial Mycoses
- Dermatophytes
皮膚黴菌
Genera:
Trichophyton 毛癬菌 , Microsporum 小芽孢孢
菌
Epidemophyton 表皮癬菌
• Usually involve hair, skin, and nails – superficial keratinized tissue
• Skin lesion is annular 環狀的 scaling 鱗 patch with a raised margin 邊
3
Dermatophytes 皮膚黴菌
• Depends on their host
* animal (zoophilic) or
* human (anthropophilic)
– M. canis 犬小芽胞菌 (originating from cats and dogs)
– T. rubrum 紅色髮癬菌
– T. tonsurans 斷髮毛癬菌
4
Tinea/ Ringworm – Site of Infection
– tinea capitis – hair, scalp
– tinea corporis – body 體癬
– tinea cruris – groin (jock itch) 股癬
– tinea pedis – feet (athlete’s foot)
– tinea unguium - nails
– tinea barbae – beard, moustache
– tinea manuum - hand
5
Tinea/ Ringworm – Site of Infection
• tinea barbae 鬚癬 – beard, moustache areas of the face
6
Tinea / Ringworm - Severe Case
7
Tinea /Ringworm
8
Tinea / Ringworm - Symptoms
Athlete’s Foot (Tinea pedis) – in feet
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Intense itchiness 癢
Broken skin between toes
Blisters / vesicular lesions 水泡
Chronic – itching, scaling tissues
Jock Itch (Tinea cruris)
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Intense itchiness
Blisters
Rash with a scaly raised border
Redness in groin area (mainly males)
May be in other inter-triginous areas - axillae
9
Tinea pedis (Athlete’s Foot) by Trichophyton rubrum
10
Tinea pedis (Athlete’s Foot)
腳癬 / 香港腳
11
Tinea cruris (Jock Itch) 股癬
12
Tinea manuum 手癬
13
Tinea unguium (Nail Fungal
Infection)
• Most affected toenails
• Lateral 側面 onychomycosis 甲癬
• Onycholysis 甲孢孢
離
• Thickening and discolouration of the nail plate 指甲板
• Destruction of the nail
• Exists with tinea pedis
14
Onychomycoses / Tinea unguium
甲癬
15
16
Tinea / Ringworm
Tinea corporis (Body Fungal Infection )
• Discolored patches on skin with a red