- COVID-19 transmission: a rapid systematic review of current knowledge
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Panagiotis Mourmouris, Lazaros Tzelves, Christiana Roidi, Anastasia Fotsali
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Osong Public Health Res Perspect. 2021;12(2):54-63. Published online April 29, 2021
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DOI: https://doi.org/10.24171/j.phrp.2021.12.2.02
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 Abstract
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- Objectives
The objective of this study was to identify the potential and definite sources of transmission of coronavirus disease 2019 (COVID-19).
Methods
Due to time constraints and the acute nature of the pandemic, we searched only PubMed/Medline from inception until January 28, 2021. We analyzed the level of evidence and risk of bias in each category and made suggestions accordingly.
Results
The virus was traced from its potential origin via possible ways of transmission to the last host. Symptomatic human-to-human transmission remains the driver of the epidemic, but asymptomatic transmission can potentially contribute in a substantial manner. Feces and fomites have both been found to contain viable virus; even though transmission through these routes has not been documented, their contribution cannot be ruled out. Finally, transmission from pregnant women to their children has been found to be low (up to 3%).
Conclusion
Even though robust outcomes cannot be easily assessed, medical personnel must maintain awareness of the main routes of transmission (via droplets and aerosols from even asymptomatic patients). This is the first attempt to systematically review the existing knowledge to produce a paper with a potentially significant clinical impact.
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