Leishmaniasis

Organism Leishmania (protozoa) Transmission Via sandflies Leishmania anastigotes infect sandflies when they take them up with their blood meal. Pathogenesis The adult female sand ingests the pathogen in the form as amastigotes when feeding...

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Leprosy

Leprosy is a chronic granulomatous disease Organism mycobacterium leprae = intracellular parasite. Incubation period tuberculoid = 2-5 years lepromatous = 8-11 years   Transmission Spread in nasal discharges to the skin or nose. Infectivity...

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Leptospirosis

Leptospirosis: also known as Weil’s Disease Organism Spirochaete bacterium called Leptospira spp incubation: 7-14 days Transmission Via the urine of an infected animal (contagious as long as it is still moist) Rats, mice, and moles are important...

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Leukaemia

Introduction Leukaemia is a broad term, applied to a range of blood cell cancers. The leukaemias can be classified as acute or chronic, and sub-classified as myeloid or lymphoid.  Thus, there are four classifications: ALL...

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Leukotriene Antagonists

Introduction These are given in oral tablet form and are used to treat severe chronic asthma. They are only ever used in conjunction with corticosteroids. Mechanism They block the LTD4 receptor on smooth muscle,...

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