New variant Covid: New Covid variant could be more infectious, finds study

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A study has revealed that a new Covid variant, C.1.2, could be more infectious and evade the vaccine protective shield.

The new variant was first found in South Africa in May, scientists from National Institute for Communicable Diseases (NICD) and the KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP)Scientists from National Institute for Communicable Diseases (NICD) and the KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP) said.

Since then it’s been found in countries like China, Congo, Mauritius, England among others.

According to the study, the variant has undergone mutations compared to C.1, the lineage that was behind the surge during first wave in South Africa.

Virologist Upasana Ray noted that the variant is a result of numerous mutations accumulated in C.1.2 line in the spike protein which makes it a lot different than the original virus that was identified in Wuhan, China in 2019.

“It could be more transmissible and has potential to spread fast. Since there are so many mutations in the spike protein, it could result in immune escape and thus a challenge for the vaccination drive worldwide if allowed to spread,” Ray from Kolkata’s CSIR-Indian Institute of Chemical Biology, told PTI.

The new variant has more mutations than other variants of concern (VOCs) or variants of interest (VOIs) detected worldwide so far, the researchers said.

They noted that the number of available sequences of C.1.2 may be an underrepresentation of the spread and frequency of the variant in South Africa and around the world.

The study found consistent increases in the number of C.1.2 genomes in South Africa each month, rising from 0.2 per cent of genomes sequenced in May to 1.6 per cent in June and then to 2 per cent in July.

“This is similar to the increases seen with the Beta and Delta variants in the country during early detection,” the authors of the study said.

According to the study, C.1.2 lineage has a mutation rate of about 41.8 mutations per year, which is about twice as fast as the current global mutation rate of the other variants.

Over half of the C.1.2 sequences have 14 mutations, but additional variations have been noticed in some of the sequences.

“Though these mutations occur in the majority of C.1.2 viruses, there is additional variation within the spike region of this lineage, suggesting ongoing intra-lineage evolution,” the authors of the study noted.

About 52 per cent of the mutations in the spike region of the C.1.2 sequences have previously been seen in other VOCs and VOIs.

The spike protein is used by the SARS-CoV-2 virus to infect and enter human cells, and most vaccines target this region.

The mutations N440K and Y449H, which have been associated with immune escape from certain antibodies, have also been noticed in C.1.2 sequences.

“While these mutations are not characteristic of current VOCs/VOIs, they have been associated with escape from certain class 3 neutralising antibodies,” the authors wrote.

They noted that these mutations together with changes in other parts of the virus likely help the virus evade antibodies, and immune response, including in patients who have already developed antibodies for the Alpha or Beta variants.

“While the phenotypic characteristics and epidemiology of C.1.2 are being defined, it is important to highlight this lineage given its concerning constellations of mutations,” the authors added.

(With inputs from PTI)

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