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A new blood test developed to predict TB

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Image source- sites.bu.edu

Seattle: An international team of researchers has identified biological markers in the blood that can help doctors predict who is at high risk of developing active tuberculosis (TB).

One-third of the world’s population is thought to be infected with Mycobacterium tuberculosis (Mtb), the bacterium that causes tuberculosis, but just a small fraction ever develops symptomatic illness.

If validated through additional clinical trials, a test based on these blood biomarkers that the researchers have now identified would allow doctors to target therapies to at-risk people, thus preventing them from getting sick.

The decade-long research effort was led by investigators from the South African Tuberculosis Vaccine Initiative at the University of Cape Town, and the Center for Infectious Disease Research, Seattle, US.

The findings were published in the journal The Lancet.

The biomarkers were identified in two stages. First, researchers collected blood samples for two years from more than 6,000 Mtb-infected but otherwise healthy adolescent volunteers in South Africa.

Analysis of the samples revealed patterns of gene expression that differed between volunteers who eventually developed TB and those who remained healthy.

This risk “signature,” confined to a set of 16 genes, could be detected in a blood sample as early as 18 months before the infected person developed active TB.

Next, the team confirmed the genetic risk signature’s predictive ability in a study of more than 4,500 volunteers in South Africa and The Gambia.

The second study group was more varied in age, health status, ethnicity and exposure to locally common strains of Mtb than volunteers in the first study.

Despite the differences, the same risk signature found in the first study was detected in the people who eventually developed active TB during the second trial. (IANS)

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Overweight And Normal Dogs Behavior Similar To Humans

The behavior had possible parallels with overweight people

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A Labrador retriever named Jack dines at a pet restaurant in San Juan, Manila, Philippines, Sept. 6, 2014.
A Labrador retriever named Jack dines at a pet restaurant in San Juan, Manila, Philippines, Sept. 6, 2014. VOA

Researchers in Hungary who found that normal and overweight dogs behaved differently in tasks involving food say the dogs’ responses were similar to those that might be expected from normal and overweight humans.

The study suggested dogs could be used as models for future research into the causes and psychological impact of human obesity, the authors of the paper from Budapest’s ELTE University said.

Researchers put two bowls — one holding a good meal, the other empty or containing less attractive food — in front of a series of dogs.

The study found that canines of a normal weight continued obeying instructions to check the second bowl for food, but the obese ones refused after a few rounds.

“We expected the overweight dog to do anything to get food, but in this test, we saw the opposite. The overweight dogs took a negative view,” test leader Orsolya Torda said.

Dog
Dog, Pixabay

“If a situation is uncertain and they cannot find food, the obese dogs are unwilling to invest energy to search for food — for them, the main thing is to find the right food with least energy involved.”

The behavior had possible parallels with overweight people who see food as a reward, said the paper, which was published in the Royal Society Open Science journal. (VOA)

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