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Since the first cases of COVID-19 have been reported in December 2019 in Wuhan, China, doctors have been scrambled to determine why the highly infectious virus is not unhappy, some people worse than others. Why are many people completely asymptomatic, while others find themselves hanging on a respirator who was fighting for their lives? A new research corpus affirms that you live or die once infected by coronavirus might have to do with one thing: your blood.

A new study on Wuhan, China and published in the medical newspaperNature Machine IntelligencePromet that you can accurately predict the severity of a COVID case of more than 10 days in advance with a maximum accuracy of 90% based on three biological markers, all determined by a single drop of blood.

Analyze blood samples of 485 infected patients, researchers identified three "critical predictive biomarkers of disease mortality".

1. Relatively high levels of lactic dehydrogenase (LDH), which mean "tissue ventilation occurring in various diseases, including pulmonary disorders such as pneumonia."
2. Low levels of lymphocytes-aka lymphopenia - one of three types of white blood cells fighting against bacteria, viruses and parasites to protect immunity.
3. An increase in high sensitivity C-reactive protein (HS-CRP), which means inflammation in the lungs.

"In particular, relatively high levels of LDH alone seem to play a crucial role in distinguishing the vast majority of cases requiring immediate medical attention," writes researchers. "This conclusion complies with current medical knowledge that high levels of LDH are associated with a fabric failure occurring in various diseases, including pulmonary disorders such as pneumonia."

How does this new study mean a major breakthrough in the Universal Battle against Covid-19, which has infected nearly 5 million people around the world and killed more than 315,000?

"It provides a simple and intuitive clinical test to quantify precisely and quickly the risk of death," explains the authors of the study. Only one blood test can arm the medical experts with a "simple and operational decision rule to quickly predict patients to the highest risk". With this knowledge, they can then prioritize high-risk patients and treat them more effectively, "potentially reducing the mortality rate."

It also encourages targeting lymphocytes such as a "potential therapeutic target". OtherClinical StudiesAlso identified white blood cells as playing a distinct role in the virus.

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