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Monday, 3 March 2014
Giardiasis
Infectious agent:
Giardia lamblia is a flagellate protozoan which lives in the
duodenum and jejunum.
Identification:
Clinical features :
Giardia infection is usually asymptomatic but may
present as acute or chronic diarrhoea associated with abdominal cramps,
bloating, nausea, vomiting, fever, fatigue and weight loss. Fat malabsorption
may lead to steatorrhoea. Symptoms usually last one to two weeks or months. The
rate of asymptomatic carriage may be high.
Method of diagnosis:
Stool microscopy for cysts or trophozoites can be used for
diagnosis...
Food or water-borne Illness
Infectious agent:
The most frequent causes of food or water-borne illnesses are
various bacteria, viruses and parasites. Refer to specific sections for detail
on the more common agents. Non-infective agents:
• heavy metal poisoning, including, cadmium, copper, lead, tin
and zinc
• fish toxins that are present in some shellfish or fish like
paralytic shellfish poisoning or ciguatera
• plant toxins which occur naturally in some foods such as toxic
fungi and green potato skins
• toxic cyanobacteria (blue green algae) overgrowth in water. Bacteria:
•...
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