Direct Invasion. Examples of invasion of the skin, conjunctiva or mucous membranes either directly or through an abrasion are;
- Skin diseases, e.g. Impetigo contagiosa, ery fungus infections, scabies.
- Venereal diseases syphilis gonorrhoea and lympho granuloma venereum.
- Conjunctivitis due to various causes.
- Hookworm, schistosomiasis.
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