John Binder proposed three layers of defense against self-replicating pathogens
John Binder proposed three layers of defense against self-replicating pathogens
On August 3, Defenses in Depth published an essay by John Binder on biodefense. Binder connects DNA synthesis screening, early outbreak detection, and measures to limit transmission through a single feature: a pathogen replicates itself inside infected cells.
In the essay, Binder begins by explaining how a virus replicates. A virus enters a cell, uses its materials and energy, copies its genome, and assembles new particles. These particles infect other cells. In a respiratory infection, they leave the body through breathing and coughing. One infected cell produces new particles, and an infected person transmits them to other people.
The first barrier operates before laboratory work begins. Guidance from the U.S. Department of Health and Human Services (HHS) recommends that suppliers of synthetic DNA and RNA screen orders for sequences associated with pathogenicity or toxicity and verify the recipient. Before any work begins, this process therefore examines both the sequence and the person or organization that will receive it.
The second layer is early outbreak detection. The U.S. National Wastewater Surveillance System helps local health authorities identify outbreak trends. Binder also proposes looking for genetic traces of pathogens in clinical samples. A SecureBio analysis of a study in The Lancet Microbe shows that the required sequencing depth and costs for this type of surveillance can be calculated in advance for different stages of an outbreak. To do this, public health services regularly collect samples and test them for signs of new pathogens.
The third layer operates after infections have appeared. Binder identifies air filters, ultraviolet light, respirators, and disinfection as barriers to transmission. Medical interventions help people who are already infected.
The three layers address a single chain of events. Screening can impede the creation of a dangerous sequence, surveillance can detect its spread, and measures in indoor spaces and medical care can reduce the number of new infections.