A study published in the journal PNAS Nexus linked several "hidden" infections to a location or cases of infected people who show no symptoms. The researchers discovered that this could be a key indicator of dengue risk.

According to the study, 8% of human activity in "super spreader" spaces accounted for more than half of dengue infections during a dengue outbreak. These spaces were also associated with 74% of all infections or several asymptomatic cases. According to the study, a third of transmission is linked to asymptomatic cases. Typically, between 50 and 70 percent of dengue cases are asymptomatic, making it difficult for public health workers to detect them.

The purpose of the study was to ascertain the asymptomatic instances significance. Symptom-free individuals could carry on with their everyday activities while unintentionally contaminating any mosquitoes that bite them, which could subsequently spread the illness to new people. The study was conducted in Perus Amazonian city of Iquitos, where 4,600 participants from two separate neighborhoods were included.

They were surveyed three times a week about their mobility. This data was used to map "activity spaces," such as residences, churches, and schools. Throughout the six-year trial period, blood analysis identified 257 symptomatic dengue cases in total. This prompted inquiries into additional participants whose activity zones coincided with those of the symptomatic individuals.

Blood testing revealed dengue infections in more than 2,000 of these location-based contacts, and more than half of them claimed to be symptom-free. The findings identified the function of asymptomatic "super spreaders" in an outbreak of dengue. Just 8% of the activity spaces were connected to more than half of the illnesses, and the majority of the cases were asymptomatic. 

(Source: https://www.tribuneindia.com/news/health/hidden-super-spreaders-spur-dengue-fever-transmission-study-490637 )