The Centers for Disease Control and Prevention has new guidance clarifying what exactly “close contact” means when it comes to transmission of SARS-Cov-2, the virus that causes COVID-19.
The previous guidance suggested that a close contact occurred when a person was within six feet of an infectious individual for 15 consecutive minutes. Now, the CDC is acknowledging that even brief contact can lead to transmission. Specifically, the new guidance suggests that those spending a total of 15 minutes of contact with an infectious person over the course of a 24-hour period should be considered in close contact.
Despite the change, most public health professionals have been clear for months that there is nothing magic about six feet. In the same way, there is nothing magic about 15 minutes. These should be used as rough estimates to indicate the types of contact that are relatively higher risk.
This new guidance, then, is an important recognition of the ease with which this virus can spread. It is not a dramatic reversal of CDC guidance, like those related to masks and the back-and-forth on testing of asymptomatic individuals.
This change reflects new evidence that has emerged. This change is an example of how science works. As an epidemiologist who studies respiratory virus transmission, I actually don’t think this change will greatly impact how we live our lives during the pandemic, but it does represent continued evidence of how easily this virus spreads. Read More
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