The symptoms of the Delta variant are:
- Continuous cough
- Loss or change in smell or taste
- Throat pain
- Runny nose
The symptoms are more associated with a common cold. For this reason, many people do not feel very sick and continue with their lives, thus becoming a source of contagion. Faced with this situation, specialists recommend that, in the event of any symptoms, tests are carried out and strict isolation is observed.
The Delta variant, also known as B.1.6172, has been noted for its ability to replicate faster than others. “It is transmitted twice as much as the Alpha variant”, He assured Soumya Swaminathan, head of the department of scientists of that international organization dependent on the UN.
Delta variant: origin
The variant was first detected in October 2020 in India. It became the most contagious strain of those that have been discovered on the European continent, being a 60% more transmissible than the British one and than the rest of the previous variants.
However, there are more worrying variants, such as the Alpha (British variant), Beta (South African) and the Gemma (Brazilian).
They are considered as “worrisome variants” those that are characterized by greater transmissibility or entail an increase in virulence or a change in the clinical picture or reduce the effectiveness of social and health measures or of available diagnoses, vaccines and therapies.
Which vaccines are effective against the Delta variant of Covid-19
According to the New England Journal of Medicine, Pfizer and AstraZeneca showed an immune response against the Delta variant, as long as the full doses. The vaccine Pfizer has an effectiveness of 88% against the Delta variant, against 95% against the original virus. And the AstraZeneca reaches an effectiveness of 67%, compared to 92% effectiveness against the original strain.
While a study presented by Johnson & Johnson demonstrates that the single dose of the Janssen generates a strong and persistent activity against the Indian variant and other prevalent ones. In contrast, according to a study carried out by the University of New York, the levels of antibodies generated were very low and those who received this vaccine may need a booster.
The vaccine Sputnik V it is effective against the resistant variant as it produces protective neutralizing antibodies. Applied the two doses, it has an effectiveness of around 90%, compared to 92% registered against the original virus, according to the Gamaleya Institute.
The vaccine Sinopharm, According to a study between the University of Sri Jayewardenepura in Sri Lanka and the University of Oxford, it generated levels of antibodies similar to those developed against the original virus, after the two doses. The Chinese pharmaceutical company announced that the effectiveness of the vaccine against the original virus is 79%.
Along the same lines, Modern yielded an effectiveness similar to that of the original virus. But, at the moment, there is no percentage of it. In any case, according to a study carried out by Canadian scientists, it was shown that it reaches an effectiveness of the 72% with the first dose. There are no published studies that demonstrate the effectiveness after the second dose.