Superspreading has become a familiar concept to many during the COVID-19 pandemic. Previous studies of infectious disease outbreaks, including the coronavirus disease (COVID-19), have found that some people are much more likely to infect others. Superspreading, where one person with an infectious disease infects an unusually large number of others, is a key feature of tuberculosis (TB) epidemiology.
Most people with tuberculosis are a disease caused by infection. Mycobacterium tuberculosisrarely causes secondary infections, and often causes no secondary infections at all. However, many studies, including landmark studies in the 1950s and 1960s that investigated tuberculosis transmission, have observed that some patients with tuberculosis are more contagious and cause more secondary infections among their contacts.
As a result, the overall impact of diagnosing someone with tuberculosis and treating them with antibiotics (which usually makes them no longer contagious within 1 to 2 weeks) on future transmission can vary greatly from person to person.
A work with a new perspective lancet infectionresearchers from Boston University Chobanian & Avedisyan and the University of Colorado Anschutz School of Medicine, are examining both historical and contemporary evidence. Mycobacterium tuberculosis Super spread. They argue that this is not only a significant challenge for global tuberculosis control, but also a potential opportunity for innovative prevention strategies.
The authors introduce the idea of ”superspreading niches” (specific parts of community contact networks where highly infectious individuals and susceptible contacts intersect) as an important framework for understanding tuberculosis superspreading and designing new tuberculosis control interventions.
We propose that identifying superspreading niche characteristics may enable novel interventions aimed at early stopping transmission between high-source cases and their susceptible contacts. ”
Karen Jacobson, MD, MPH, senior author and associate professor of medicine, Boston University School of Medicine
Researchers say superspreading is an important but poorly understood phenomenon observed in a wide range of infectious diseases, including SARS-CoV2 (the virus that causes COVID-19).
“We know that multiple factors, for example, how contagious someone is, the size of their social contact network, and other epidemiological factors, all contribute to superspreads, but our understanding of how these factors work together remains vague and falls short of what is needed to improve public health efforts. There are also interesting results from mathematical modeling studies, Our findings suggest that stopping the spread could have a large and outsized impact on infectious disease epidemics. This may also apply to tuberculosis, providing an important opportunity for new tuberculosis prevention strategies that could support continued progress in the global fight against tuberculosis,” added Jacobson, who is also medical director of the Boston Medical Center Tuberculosis Clinic.
The researchers also highlight that tuberculosis may be uniquely suited to prevention strategies focused on hyperprevalence. Unlike directly transmitted respiratory viruses, where infection typically lasts only a few days, tuberculosis is a more slowly progressive disease, thus providing greater opportunity to develop interventions to interrupt transmission.
Additionally, people who receive effective antibiotic therapy for tuberculosis quickly become non-infectious, usually within a few days, providing a quick way to “stop” transmission from someone who is highly infectious. Finally, preventive therapy for exposed people Mycobacterium tuberculosis It is highly effective in people who have not yet developed the disease and may serve as an important tool in stopping the disease. Mycobacterium tuberculosis Super spread.
sauce:
Boston University School of Medicine
Reference magazines:
Brown, T.S. others (2026) Understanding and leveraging superspreading to stop Mycobacterium tuberculosis infection. lancet infection. DOI:10.1016/S1473-3099(26)00168-4. https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(26)00168-4/abstract.
