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Delta Covid variant, what are the symptoms? Contagiousness and vaccine resistance, that’s why it’s dangerous

Delta Covid variant, what are the symptoms? Contagiousness and vaccine resistance, that’s why it’s dangerous
Delta Covid variant, what are the symptoms? Contagiousness and vaccine resistance, that’s why it’s dangerous

Now it’s called Delta variant, but everyone knows her as an Indian. It is the Coronavirus mutation that has led to a surge in infections in India: on 12 April, in fact, the South Asian nation registered 160 thousand new cases of Covid. Among the most affected countries in the world. Then the variant spread to more than 50 states, mainly in UK, with three distinct sub-alignments: what worries is B.1.617.2, more contagious than the others.

Delta variant, fear Great Britain: contagion boom, Johnson considers postponing reopening

Features

The Delta variant includes two mutations of the Spike protein that have already been identified in two other variants sequenced around the world. There is therefore no big difference from the others from a scientific point of view. However, the consequences are different. Because the latest studies indicate that it is able to escape the antibodies produced by the vaccine and is more contagious.

Contagiousness

Research published in the Lancet on June 3 indicates that the new strain of the virus is 50-60% more contagious than the so-called Alpha (or English) variant. But not only. It also has a higher risk of hospitalization: up to 2.6 times higher. And just look at the confirmed cases of the variant in the UK, which this week rose to 12,431 compared to 6,959 in the previous one: representing up to 75% of new coronavirus cases.

Symptoms

The symptoms of the Delta variant do not change compared to the common ones of Covid. Which therefore vary according to the severity of the disease. It goes from the absence of symptoms (asymptomatic) to fever, cough, sore throat, weakness, fatigue and muscle pain. Severe cases, on the other hand, can present with pneumonia, acute respiratory distress syndrome, and other complications – all potentially fatal. The infection may then present with loss or decrease of smell and loss or alteration of taste. Recurrent symptoms are also headache, chills, myalgia, asthenia, vomiting and / or diarrhea.

Vaccine efficacy

The Indian or Delta variant is more resistant to vaccines. Although 73% of Delta cases involve unvaccinated people and only 3.7% people who received both doses. And of these, only 5% were hospitalized. But the data are not all positive. Because the number of antibodies developed by those who injected one or two doses of Pfizer vaccine is lower against the Delta variant than the Alpha variant.

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