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suck abstract from ncbi


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pmid32301478      Ann+Acad+Med+Singap 2020 ; 49 (3): 161-165
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  • Counting Coronavirus Disease 2019 (COVID-19) Cases: Case Definitions, Screened Populations and Testing Techniques Matter #MMPMID32301478
  • Koh D; Cunningham AC
  • Ann Acad Med Singap 2020[Mar]; 49 (3): 161-165 PMID32301478show ga
  • While counting cases of disease appears straightforward, there are issues to consider when enumerating disease counts during an epidemic. For example, for Coronavirus Disease-2019 (COVID-19), how is a case defined? Hubei province in China changed its case definition twice in a fortnight-from laboratory-confirmed cases to clinically-confirmed cases without laboratory tests, and back to laboratory-confirmed cases. This caused confusion in the reported number of cases. If a confirmed case requires laboratory testing, what is the population who are laboratory-tested? Due to limited laboratory testing capacity in the early phase of an emerging epidemic, only "suspected cases" are laboratory-tested in most countries. This will result in underdiagnosis of confirmed cases and also raises the question: how is a "suspect case" defined? With the passage of time and increased capability to perform laboratory tests, more people can be screened and the number of confirmed cases will increase. What are the technical considerations of laboratory testing? This includes specimen collection (variable collection methods), samples collected (upper or lower respiratory tract biospecimens), time of collection in relation to course of disease, different laboratory test methods and kits (not all of which may be standardised or approved by authorities such as the Food and Drug Administration). Are approved laboratory facilities and trained manpower available, and how are test results interpreted and false-negatives excluded? These issues will affect the accuracy of disease counts, which in turn will have implications on how we mount an appropriate response to the outbreak.
  • |*Betacoronavirus[MESH]
  • |*Clinical Laboratory Techniques[MESH]
  • |COVID-19[MESH]
  • |COVID-19 Testing[MESH]
  • |Coronavirus Infections/*diagnosis[MESH]
  • |Humans[MESH]
  • |Pandemics[MESH]
  • |Pneumonia, Viral/*diagnosis[MESH]
  • |Practice Guidelines as Topic[MESH]
  • |Reproducibility of Results[MESH]
  • |SARS-CoV-2[MESH]


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