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Evidence summary for COVID-19 viral load over course of infection

Status: Published on

To inform national efforts in response to COVID-19, HIQA is developing evidence summaries to answer specific research questions posed by the National Public Health Emergency Team.

This summary details the best available evidence to answer the following question: What is the viral load over the course of the infection (including any asymptomatic or pre-symptomatic phase), and the duration of infectivity?

Version history



Specific updates


1 April 2020



21 April 2020

Updated search with 26 new studies


9 June 2020

Updated search with 60 new studies