ECONOMYNEXT – Another 82 gene sequenced samples in Sri Lanka came back positive for the Omicron variant of SARS-CoV-2, the virus that causes COVID-19, officials said, taking total confirmations of the new strain in the island to over 350.
Gene sequencing tests in Sri Lanka are carried out by the Allergy, Immunology and Cell Biology Unit of the Faculty of Medicine, University of Sri Jayawardenapura (USJ).
Dr Chandima Jeewandara, director of the unit, the 82 samples were out of a total of 88 collected from the community in the fourth week of January. The other six samples tested positive for the Delta variant, said Jeewandara.
The 82 Omicron cases include a mix of the two main Omicron lineages BA.1 and BA.2.
Omicron sublineages were detected at the following locations: 30 cases of BA.1 were detected in the Colombo Municipal Council (CMC) area, Colombo, the National Institute of Mental Health (NIMH), Kesbewa and Mathugama; 22 cases of BA.1.1 were detected in CMC, Colombo, Kesbewa and Mathugama.
Twenty-eight cases of BA.2 were detected in CMC and Colombo, while two cases of B.1.1.529 were also detected in Colombo.
Different Delta sub lineages were detected at the following locations: four cases of AY.104 (Sri Lanka delta sub-lineage) were detected in Horona, Mathugama, Pandura and NIMH. 1 case of AY.95 (Sri Lanka delta sub-lineage) was detected in Horana. One case of B.1.617.2 was detected at the NIMH.
Currently 25 percent of the sequenced samples in Sri Lanka are BA.2, which was named as a variant of interest by the UK Health Security Agency.
Early analysis has suggested BA.2 has a higher growth rate than BA.1 and is, therefore, more transmissible than BA.1. However, early data shows that immune evasion is less with BA.2 than with BA.1. (Colombo/Jan29/2022)