COVID: Is the gap in vaccine doses the reason for the spread of the delta form of the virus?


Cambridge (UK). The ‘delta’ form of the corona virus, which was first found in India, is now becoming a major cause of infection in Britain. Some experts have cautioned that the spread of the delta form could be up to 100 percent higher than the alpha form that wreaked havoc here earlier. But this is not the only reason for delta to dominate. Forms capable of dominating the virus have a biological advantage, which is mutation, through which these forms spread very easily between people. Due to the mutation, the effect of the less infectious form also decreases and the more infective form dominates.

Although the impact of the delta form among people is more complex than the earlier forms, it is also possible that the reason behind the spread of this form of the virus and its dominance in the UK is not only because it is more contagious, but Government policies can also be responsible for this. This can be understood by distinguishing the powerful forces behind its evolutionary changes.

For example, the first is natural selection, which occurs when one type of organism completely dominates the other, and with the passage of time one succeeds while the other perishes. This can be understood as, when a cheetah that can run at a higher speed, it overtakes its opponent and is therefore more capable of catching prey. In this way he manages to protect and enhance himself. The second cheetah, whose speed is a little less, does not get enough food or if it is not able to attract the female cheetah, then due to this it cannot increase its offspring.

The second force is the artificial election which is a part of the natural election itself. In this, the person decides which organism will survive and grow. An example is the breeder of horses. In this, the breeder matches skilled and capable horses with others so that the next generation also has the same characteristics as these horses.Also read:- Decoding Long Covid: Bones getting hollow due to prolonged steroids to corona patients

The third force is unintentional selection. In this, there are accidental developmental effects when humans mix with the environment. It is also part of natural selection and is becoming an important force in the world as the population is increasing and humans are making changes in the global environment. A good example of this is bacteria that are building resistance against modern drugs. Antibiotics are given to kill the bacteria, so we unknowingly give the bacteria a chance to develop resistance to our treatment.

Another example is the farming practices that lead to the spread of diseases between plants. People plant trees and plants very close, due to which there is a high risk of spreading diseases among them. Some researchers say that this was also the reason for the outbreak of swine flu and possibly Kovid-19 in 2009.

Overall, it is meant to say that planting trees too close or large differences in the doses of vaccines causes some changes in the world. Many such changes such as ‘super bugs’ on which antibiotics are ineffective or new forms of viruses can be harmful for us. These are the forces that are proving helpful in the spread of Delta.

Talking about the delta form, it can infect people who have received half the dose of the anti-Covid-19 vaccine and that is why it is becoming dominant. According to Public Health England, people who have received both doses of the Pfizer vaccine may have up to 88 percent protection against it, but those who have received the same dose of either Pfizer or AstraZeneca vaccine will only be protected by 33.5 percent.

From the perspective of evolutionary selection, the UK government’s extension of the interval between the first and second doses of the vaccine is because the delta form has had a chance to infect people. In this way, while the delta form spread in India due to natural elections, perhaps the reason for its spread in Britain was inadvertent election and that is why it persisted and grew. Apart from this, living conditions are overcrowded in the city of Bolton in the North West of England, where the delta form was first spread. Therefore, these circumstances and the very contagious nature of itself is also the reason for its spread.


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