IMED1004 Lecture Notes - Lecture 9: 1918 Flu Pandemic, Food Contaminant, Common Source
17 Sep 2018
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Document Summary
2018 berries from chile and china were recalled. Hav still infectious after being dried and stores for 1 month. Hav survives on various non-porous surfaces aluminium, china and latex for 60 days. Frozen storage of hav- contaminated berries and herbs had little effect on hav survival over the study period of 3 months. Hep a virus stores in frozen state in labs infectious. Sundried tomatoes:: in 2009: outbreak was extensive and sustained despite public health interventions, complicated by limitations in food testing capability and complex supply chains. Often food contamination (commercial preparation), air or water. E. g. hepatitis a, legionella and cooling tower, contamination of water supply. Epi curve shows continuing cases with no real pattern; may look like repeated series of point sources. Common source outbreaks: e. g. food poisoning from single source, usually a common event (e. g. restaurant, wedding, steep rise and rapid fall of curve with tight temporal clustering. Initial case, then successive waves of cases with interval in-between.
