The management of human immunodeficiency virus 1 (HIV), an autoimmune disorder that cripples the immune system by attacking healthy cells, remains a major global health challenge in developing countries that lack infrastructure and trained medical professionals. Investigators have designed a portable and affordable mobile diagnostic tool, utilizing a cellphone and nanotechnology, with the ability to detect HIV viruses and monitor its management in resource-limited regions. The novel platform is described in a paper published in Nature Communications.

"Early detection of HIV is critical to prevent disease progression and transmission, and it requires long-term monitoring, which can be a burden for families that have to travel to reach a clinic or hospital," said senior author. "This rapid and low-cost cellphone system represents a new method for detecting acute infection, which would reduce the risk of virus transmission and could also be used to detect early treatment failure."

Traditional virus monitoring methods for HIV are expensive, requiring the use of polymerase chain reaction (PCR). Researchers sought to design an affordable, simple tool that makes HIV testing and monitoring possible for individuals in developing countries with less access to medical care.

Utilizing nanotechnology, a microchip, a cellphone and a 3D-printed phone attachment, the researchers created a platform that can detect the RNA nucleic acids of the virus from a single drop of blood. The device detects the amplified HIV nucleic acids through on-phone monitoring of the motion of DNA-engineered beads without using bulky or expensive equipment. The detection precision was evaluated for specificity and sensitivity.

Researchers found that the platform allowed the detection of HIV with 99.1 percent specificity and 94.6 percent sensitivity at a clinically relevant threshold value of 1,000 virus particles/ml, with results within one hour. Notably, the total material cost of the microchip, phone attachment and reagents was less than $5 per test.

"Health workers in developing countries could easily use these devices when they travel to perform HIV testing and monitoring. Because the test is so quick, critical decisions about the next medical step could be made right there," said the author. "This would eliminate the burden of trips to the medical clinic and provide individuals with a more efficient means for managing their HIV."

"We could use this same technology as a rapid and low-cost diagnostic tool for other viruses and bacteria as well," said lead author. "This platform could help a lot of people worldwide."

https://www.nature.com/articles/s41467-018-06727-8

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